Add StatsAPI to README

README.md

@@ -20,6 +20,7 @@ There is a main configuration file with basic settings that point to the other c
   "collectors" : "collectors.json",
   "receivers" : "receivers.json",
   "router" : "router.json",
+  "stats_api" : "api.json",
   "interval": 10,
   "duration": 1
 }
@@ -32,6 +33,7 @@ See the component READMEs for their configuration:
 * [`sinks`](./sinks/README.md)
 * [`receivers`](./receivers/README.md)
 * [`router`](./internal/metricRouter/README.md)
+* [`stats_api`](./internal/metricRouter/StatsApi.md)
 
 
 # Installation

cc-metric-collector.go

@@ -28,6 +28,7 @@ type CentralConfigFile struct {
 	RouterConfigFile    string `json:"router"`
 	SinkConfigFile      string `json:"sinks"`
 	ReceiverConfigFile  string `json:"receivers,omitempty"`
+	StatsApiConfigFile  string `json:"stats_api,omitempty"`
 }
 
 func LoadCentralConfiguration(file string, config *CentralConfigFile) error {
@@ -52,6 +53,7 @@ type RuntimeConfig struct {
 	CollectManager  collectors.CollectorManager
 	SinkManager     sinks.SinkManager
 	ReceiveManager  receivers.ReceiveManager
+	StatsApi        mr.StatsApi
 	MultiChanTicker mct.MultiChanTicker
 
 	Channels []chan lp.CCMetric
@@ -152,11 +154,16 @@ func shutdownHandler(config *RuntimeConfig, shutdownSignal chan os.Signal) {
 		cclog.Debug("Shutdown SinkManager...")
 		config.SinkManager.Close()
 	}
+	if config.StatsApi != nil {
+		cclog.Debug("Shutdown StatsApi...")
+		config.StatsApi.Close()
+	}
 }
 
 func mainFunc() int {
 	var err error
 	use_recv := false
+	use_api := false
 
 	// Initialize runtime configuration
 	rcfg := RuntimeConfig{
@@ -164,6 +171,7 @@ func mainFunc() int {
 		CollectManager: nil,
 		SinkManager:    nil,
 		ReceiveManager: nil,
+		StatsApi:       nil,
 		CliArgs:        ReadCli(),
 	}
 
@@ -253,6 +261,16 @@ func mainFunc() int {
 		use_recv = true
 	}
 
+	// Create new statistics API manager
+	if len(rcfg.ConfigFile.StatsApiConfigFile) > 0 {
+		rcfg.StatsApi, err = mr.NewStatsApi(rcfg.MultiChanTicker, &rcfg.Sync, rcfg.ConfigFile.StatsApiConfigFile)
+		if err != nil {
+			cclog.Error(err.Error())
+			return 1
+		}
+		use_api = true
+	}
+
 	// Create shutdown handler
 	shutdownSignal := make(chan os.Signal, 1)
 	signal.Notify(shutdownSignal, os.Interrupt)
@@ -260,6 +278,11 @@ func mainFunc() int {
 	rcfg.Sync.Add(1)
 	go shutdownHandler(&rcfg, shutdownSignal)
 
+	// Start the stats api early to be prepared for init settings
+	if use_api {
+		rcfg.StatsApi.Start()
+	}
+
 	// Start the managers
 	rcfg.MetricRouter.Start()
 	rcfg.SinkManager.Start()

collectors/beegfsmetaMetric.go

@@ -16,6 +16,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const DEFAULT_BEEGFS_CMD = "beegfs-ctl"
@@ -33,6 +34,7 @@ type BeegfsMetaCollector struct {
 	matches               map[string]string
 	config                BeegfsMetaCollectorConfig
 	skipFS                map[string]struct{}
+	statsProcessedMetrics int64
 }
 
 func (m *BeegfsMetaCollector) Init(config json.RawMessage) error {
@@ -105,6 +107,7 @@ func (m *BeegfsMetaCollector) Init(config json.RawMessage) error {
 	if err != nil {
 		return fmt.Errorf("BeegfsMetaCollector.Init(): Failed to find beegfs-ctl binary '%s': %v", m.config.Beegfs, err)
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -218,10 +221,12 @@ func (m *BeegfsMetaCollector) Read(interval time.Duration, output chan lp.CCMetr
 				y, err := lp.New(key, m.tags, m.meta, map[string]interface{}{"value": value}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *BeegfsMetaCollector) Close() {

collectors/beegfsstorageMetric.go

@@ -16,6 +16,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 // Struct for the collector-specific JSON config
@@ -31,6 +32,7 @@ type BeegfsStorageCollector struct {
 	matches               map[string]string
 	config                BeegfsStorageCollectorConfig
 	skipFS                map[string]struct{}
+	statsProcessedMetrics int64
 }
 
 func (m *BeegfsStorageCollector) Init(config json.RawMessage) error {
@@ -98,6 +100,7 @@ func (m *BeegfsStorageCollector) Init(config json.RawMessage) error {
 	if err != nil {
 		return fmt.Errorf("BeegfsStorageCollector.Init(): Failed to find beegfs-ctl binary '%s': %v", m.config.Beegfs, err)
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -210,10 +213,12 @@ func (m *BeegfsStorageCollector) Read(interval time.Duration, output chan lp.CCM
 				y, err := lp.New(key, m.tags, m.meta, map[string]interface{}{"value": value}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *BeegfsStorageCollector) Close() {

collectors/cpufreqCpuinfoMetric.go

@@ -12,6 +12,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 //
@@ -37,6 +38,7 @@ type CPUFreqCpuInfoCollectorTopology struct {
 type CPUFreqCpuInfoCollector struct {
 	metricCollector
 	topology              []*CPUFreqCpuInfoCollectorTopology
+	statsProcessedMetrics int64
 }
 
 func (m *CPUFreqCpuInfoCollector) Init(config json.RawMessage) error {
@@ -155,7 +157,7 @@ func (m *CPUFreqCpuInfoCollector) Init(config json.RawMessage) error {
 			"package_id": t.physicalPackageID,
 		}
 	}
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -196,6 +198,7 @@ func (m *CPUFreqCpuInfoCollector) Read(interval time.Duration, output chan lp.CC
 						return
 					}
 					if y, err := lp.New("cpufreq", t.tagSet, m.meta, map[string]interface{}{"value": value}, now); err == nil {
+						m.statsProcessedMetrics++
 						output <- y
 					}
 				}
@@ -203,6 +206,7 @@ func (m *CPUFreqCpuInfoCollector) Read(interval time.Duration, output chan lp.CC
 			}
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *CPUFreqCpuInfoCollector) Close() {

collectors/cpufreqMetric.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"golang.org/x/sys/unix"
 )
 
@@ -40,6 +41,7 @@ type CPUFreqCollectorTopology struct {
 type CPUFreqCollector struct {
 	metricCollector
 	topology              []CPUFreqCollectorTopology
+	statsProcessedMetrics int64
 	config                struct {
 		ExcludeMetrics []string `json:"exclude_metrics,omitempty"`
 	}
@@ -166,7 +168,7 @@ func (m *CPUFreqCollector) Init(config json.RawMessage) error {
 			"package_id": t.physicalPackageID,
 		}
 	}
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -203,9 +205,11 @@ func (m *CPUFreqCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if y, err := lp.New("cpufreq", t.tagSet, m.meta, map[string]interface{}{"value": cpuFreq}, now); err == nil {
+			m.statsProcessedMetrics++
 			output <- y
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *CPUFreqCollector) Close() {

collectors/cpustatMetric.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const CPUSTATFILE = `/proc/stat`
@@ -25,6 +26,7 @@ type CpustatCollector struct {
 	matches               map[string]int
 	cputags               map[string]map[string]string
 	nodetags              map[string]string
+	statsProcessedMetrics int64
 }
 
 func (m *CpustatCollector) Init(config json.RawMessage) error {
@@ -86,6 +88,7 @@ func (m *CpustatCollector) Init(config json.RawMessage) error {
 			num_cpus++
 		}
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -106,6 +109,7 @@ func (m *CpustatCollector) parseStatLine(linefields []string, tags map[string]st
 	for name, value := range values {
 		y, err := lp.New(name, tags, m.meta, map[string]interface{}{"value": (value * 100.0) / total}, t)
 		if err == nil {
+			m.statsProcessedMetrics++
 			output <- y
 		}
 	}
@@ -141,8 +145,10 @@ func (m *CpustatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		time.Now(),
 	)
 	if err == nil {
+		m.statsProcessedMetrics++
 		output <- num_cpus_metric
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *CpustatCollector) Close() {

collectors/customCmdMetric.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	influx "github.com/influxdata/line-protocol"
 )
 
@@ -28,6 +29,9 @@ type CustomCmdCollector struct {
 	config                 CustomCmdCollectorConfig
 	commands               []string
 	files                  []string
+	statsProcessedMetrics  int64
+	statsProcessedCommands int64
+	statsProcessedFiles    int64
 }
 
 func (m *CustomCmdCollector) Init(config json.RawMessage) error {
@@ -66,6 +70,9 @@ func (m *CustomCmdCollector) Init(config json.RawMessage) error {
 	m.handler = influx.NewMetricHandler()
 	m.parser = influx.NewParser(m.handler)
 	m.parser.SetTimeFunc(DefaultTime)
+	m.statsProcessedMetrics = 0
+	m.statsProcessedFiles = 0
+	m.statsProcessedCommands = 0
 	m.init = true
 	return nil
 }
@@ -100,9 +107,13 @@ func (m *CustomCmdCollector) Read(interval time.Duration, output chan lp.CCMetri
 
 			y := lp.FromInfluxMetric(c)
 			if err == nil {
+				m.statsProcessedMetrics++
+				stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 				output <- y
 			}
 		}
+		m.statsProcessedCommands++
+		stats.ComponentStatInt(m.name, "processed_commands", m.statsProcessedCommands)
 	}
 	for _, file := range m.files {
 		buffer, err := ioutil.ReadFile(file)
@@ -122,9 +133,13 @@ func (m *CustomCmdCollector) Read(interval time.Duration, output chan lp.CCMetri
 			}
 			y := lp.FromInfluxMetric(f)
 			if err == nil {
+				m.statsProcessedMetrics++
+				stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 				output <- y
 			}
 		}
+		m.statsProcessedFiles++
+		stats.ComponentStatInt(m.name, "processed_files", m.statsProcessedFiles)
 	}
 }
 

collectors/diskstatMetric.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 //	"log"
@@ -23,9 +24,8 @@ type DiskstatCollectorConfig struct {
 
 type DiskstatCollector struct {
 	metricCollector
-	//matches map[string]int
-	config IOstatCollectorConfig
-	//devices map[string]IOstatCollectorEntry
+	config                DiskstatCollectorConfig
+	statsProcessedMetrics int64
 }
 
 func (m *DiskstatCollector) Init(config json.RawMessage) error {
@@ -44,6 +44,7 @@ func (m *DiskstatCollector) Init(config json.RawMessage) error {
 		return err
 	}
 	defer file.Close()
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -89,12 +90,16 @@ func (m *DiskstatCollector) Read(interval time.Duration, output chan lp.CCMetric
 		y, err := lp.New("disk_total", tags, m.meta, map[string]interface{}{"value": total}, time.Now())
 		if err == nil {
 			y.AddMeta("unit", "GBytes")
+			m.statsProcessedMetrics++
+			stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 			output <- y
 		}
 		free := (stat.Bfree * uint64(stat.Bsize)) / uint64(1000000000)
 		y, err = lp.New("disk_free", tags, m.meta, map[string]interface{}{"value": free}, time.Now())
 		if err == nil {
 			y.AddMeta("unit", "GBytes")
+			m.statsProcessedMetrics++
+			stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 			output <- y
 		}
 		perc := (100 * (total - free)) / total
@@ -105,6 +110,8 @@ func (m *DiskstatCollector) Read(interval time.Duration, output chan lp.CCMetric
 	y, err := lp.New("part_max_used", map[string]string{"type": "node"}, m.meta, map[string]interface{}{"value": int(part_max_used)}, time.Now())
 	if err == nil {
 		y.AddMeta("unit", "percent")
+		m.statsProcessedMetrics++
+		stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 		output <- y
 	}
 }

collectors/gpfsMetric.go

@@ -15,6 +15,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const DEFAULT_GPFS_CMD = "mmpmon"
@@ -35,6 +36,7 @@ type GpfsCollector struct {
 	skipFS                map[string]struct{}
 	lastTimestamp         time.Time // Store time stamp of last tick to derive bandwidths
 	lastState             map[string]GpfsCollectorLastState
+	statsProcessedMetrics int64
 }
 
 func (m *GpfsCollector) Init(config json.RawMessage) error {
@@ -86,7 +88,7 @@ func (m *GpfsCollector) Init(config json.RawMessage) error {
 		return fmt.Errorf("failed to find mmpmon binary '%s': %v", m.config.Mmpmon, err)
 	}
 	m.config.Mmpmon = p
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -211,12 +213,14 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_bytes_read", m.tags, m.meta, map[string]interface{}{"value": bytesRead}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 		if m.config.SendBandwidths {
 			if lastBytesRead := m.lastState[filesystem].bytesRead; lastBytesRead >= 0 {
 				bwRead := float64(bytesRead-lastBytesRead) / timeDiff
 				if y, err := lp.New("gpfs_bw_read", m.tags, m.meta, map[string]interface{}{"value": bwRead}, timestamp); err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -231,12 +235,14 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_bytes_written", m.tags, m.meta, map[string]interface{}{"value": bytesWritten}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 		if m.config.SendBandwidths {
 			if lastBytesWritten := m.lastState[filesystem].bytesRead; lastBytesWritten >= 0 {
 				bwWrite := float64(bytesWritten-lastBytesWritten) / timeDiff
 				if y, err := lp.New("gpfs_bw_write", m.tags, m.meta, map[string]interface{}{"value": bwWrite}, timestamp); err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -258,6 +264,7 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_num_opens", m.tags, m.meta, map[string]interface{}{"value": numOpens}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// number of closes
@@ -270,6 +277,7 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_num_closes", m.tags, m.meta, map[string]interface{}{"value": numCloses}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// number of reads
@@ -282,6 +290,7 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_num_reads", m.tags, m.meta, map[string]interface{}{"value": numReads}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// number of writes
@@ -294,6 +303,7 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_num_writes", m.tags, m.meta, map[string]interface{}{"value": numWrites}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// number of read directories
@@ -306,6 +316,7 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		}
 		if y, err := lp.New("gpfs_num_readdirs", m.tags, m.meta, map[string]interface{}{"value": numReaddirs}, timestamp); err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// Number of inode updates
@@ -317,9 +328,11 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 			continue
 		}
 		if y, err := lp.New("gpfs_num_inode_updates", m.tags, m.meta, map[string]interface{}{"value": numInodeUpdates}, timestamp); err == nil {
+			m.statsProcessedMetrics++
 			output <- y
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *GpfsCollector) Close() {

collectors/infinibandMetric.go

@@ -7,6 +7,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"golang.org/x/sys/unix"
 
 	"encoding/json"
@@ -18,11 +19,16 @@ import (
 
 const IB_BASEPATH = "/sys/class/infiniband/"
 
+type InfinibandCollectorMetric struct {
+	path string
+	unit string
+}
+
 type InfinibandCollectorInfo struct {
 	LID              string                               // IB local Identifier (LID)
 	device           string                               // IB device
 	port             string                               // IB device port
-	portCounterFiles map[string]string // mapping counter name -> sysfs file
+	portCounterFiles map[string]InfinibandCollectorMetric // mapping counter name -> InfinibandCollectorMetric
 	tagSet           map[string]string                    // corresponding tag list
 	lastState        map[string]int64                     // State from last measurement
 }
@@ -36,6 +42,7 @@ type InfinibandCollector struct {
 	}
 	info                  []*InfinibandCollectorInfo
 	lastTimestamp         time.Time // Store time stamp of last tick to derive bandwidths
+	statsProcessedMetrics int64
 }
 
 // Init initializes the Infiniband collector by walking through files below IB_BASEPATH
@@ -106,16 +113,16 @@ func (m *InfinibandCollector) Init(config json.RawMessage) error {
 
 		// Check access to counter files
 		countersDir := filepath.Join(path, "counters")
-		portCounterFiles := map[string]string{
-			"ib_recv":      filepath.Join(countersDir, "port_rcv_data"),
-			"ib_xmit":      filepath.Join(countersDir, "port_xmit_data"),
-			"ib_recv_pkts": filepath.Join(countersDir, "port_rcv_packets"),
-			"ib_xmit_pkts": filepath.Join(countersDir, "port_xmit_packets"),
+		portCounterFiles := map[string]InfinibandCollectorMetric{
+			"ib_recv":      {path: filepath.Join(countersDir, "port_rcv_data"), unit: "bytes"},
+			"ib_xmit":      {path: filepath.Join(countersDir, "port_xmit_data"), unit: "bytes"},
+			"ib_recv_pkts": {path: filepath.Join(countersDir, "port_rcv_packets"), unit: "packets"},
+			"ib_xmit_pkts": {path: filepath.Join(countersDir, "port_xmit_packets"), unit: "packets"},
 		}
-		for _, counterFile := range portCounterFiles {
-			err := unix.Access(counterFile, unix.R_OK)
+		for _, counter := range portCounterFiles {
+			err := unix.Access(counter.path, unix.R_OK)
 			if err != nil {
-				return fmt.Errorf("unable to access %s: %v", counterFile, err)
+				return fmt.Errorf("unable to access %s: %v", counter.path, err)
 			}
 		}
 
@@ -144,7 +151,7 @@ func (m *InfinibandCollector) Init(config json.RawMessage) error {
 	if len(m.info) == 0 {
 		return fmt.Errorf("found no IB devices")
 	}
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -165,14 +172,14 @@ func (m *InfinibandCollector) Read(interval time.Duration, output chan lp.CCMetr
 	m.lastTimestamp = now
 
 	for _, info := range m.info {
-		for counterName, counterFile := range info.portCounterFiles {
+		for counterName, counterDef := range info.portCounterFiles {
 
 			// Read counter file
-			line, err := ioutil.ReadFile(counterFile)
+			line, err := ioutil.ReadFile(counterDef.path)
 			if err != nil {
 				cclog.ComponentError(
 					m.name,
-					fmt.Sprintf("Read(): Failed to read from file '%s': %v", counterFile, err))
+					fmt.Sprintf("Read(): Failed to read from file '%s': %v", counterDef.path, err))
 				continue
 			}
 			data := strings.TrimSpace(string(line))
@@ -189,7 +196,9 @@ func (m *InfinibandCollector) Read(interval time.Duration, output chan lp.CCMetr
 			// Send absolut values
 			if m.config.SendAbsoluteValues {
 				if y, err := lp.New(counterName, info.tagSet, m.meta, map[string]interface{}{"value": v}, now); err == nil {
+					y.AddMeta("unit", counterDef.unit)
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 
@@ -198,7 +207,9 @@ func (m *InfinibandCollector) Read(interval time.Duration, output chan lp.CCMetr
 				if info.lastState[counterName] >= 0 {
 					rate := float64((v - info.lastState[counterName])) / timeDiff
 					if y, err := lp.New(counterName+"_bw", info.tagSet, m.meta, map[string]interface{}{"value": rate}, now); err == nil {
+						y.AddMeta("unit", counterDef.unit+"/sec")
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 				// Save current state
@@ -207,6 +218,7 @@ func (m *InfinibandCollector) Read(interval time.Duration, output chan lp.CCMetr
 		}
 
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *InfinibandCollector) Close() {

collectors/iostatMetric.go

@@ -6,6 +6,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 
 	//	"log"
 	"encoding/json"
@@ -32,6 +33,7 @@ type IOstatCollector struct {
 	matches               map[string]int
 	config                IOstatCollectorConfig
 	devices               map[string]IOstatCollectorEntry
+	statsProcessedMetrics int64
 }
 
 func (m *IOstatCollector) Init(config json.RawMessage) error {
@@ -102,6 +104,7 @@ func (m *IOstatCollector) Init(config json.RawMessage) error {
 			lastValues: values,
 		}
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return err
 }
@@ -141,6 +144,7 @@ func (m *IOstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					y, err := lp.New(name, entry.tags, m.meta, map[string]interface{}{"value": int(diff)}, time.Now())
 					if err == nil {
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 				entry.lastValues[name] = x
@@ -148,6 +152,7 @@ func (m *IOstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 		m.devices[device] = entry
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *IOstatCollector) Close() {

collectors/ipmiMetric.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const IPMITOOL_PATH = `ipmitool`
@@ -29,6 +30,7 @@ type IpmiCollector struct {
 	config                IpmiCollectorConfig
 	ipmitool              string
 	ipmisensors           string
+	statsProcessedMetrics int64
 }
 
 func (m *IpmiCollector) Init(config json.RawMessage) error {
@@ -56,6 +58,7 @@ func (m *IpmiCollector) Init(config json.RawMessage) error {
 	if len(m.ipmitool) == 0 && len(m.ipmisensors) == 0 {
 		return errors.New("no IPMI reader found")
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -94,6 +97,7 @@ func (m *IpmiCollector) readIpmiTool(cmd string, output chan lp.CCMetric) {
 			if err == nil {
 				y.AddMeta("unit", unit)
 				output <- y
+				m.statsProcessedMetrics++
 			}
 		}
 	}
@@ -123,6 +127,7 @@ func (m *IpmiCollector) readIpmiSensors(cmd string, output chan lp.CCMetric) {
 						y.AddMeta("unit", lv[4])
 					}
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -141,6 +146,7 @@ func (m *IpmiCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 			m.readIpmiSensors(m.config.IpmisensorsPath, output)
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *IpmiCollector) Close() {

collectors/likwidMetric.go

@@ -15,8 +15,12 @@ import (
 	"io/ioutil"
 	"math"
 	"os"
+	"os/signal"
+	"sort"
 	"strconv"
 	"strings"
+	"sync"
+	"syscall"
 	"time"
 	"unsafe"
 
@@ -24,6 +28,7 @@ import (
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
 	topo "github.com/ClusterCockpit/cc-metric-collector/internal/ccTopology"
 	agg "github.com/ClusterCockpit/cc-metric-collector/internal/metricAggregator"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"github.com/NVIDIA/go-nvml/pkg/dl"
 )
 
@@ -46,6 +51,16 @@ type LikwidCollectorEventsetConfig struct {
 	Metrics []LikwidCollectorMetricConfig `json:"metrics"`
 }
 
+type LikwidEventsetConfig struct {
+	internal int
+	gid      C.int
+	eorder   []*C.char
+	estr     *C.char
+	go_estr  string
+	results  map[int]map[string]interface{}
+	metrics  map[int]map[string]float64
+}
+
 type LikwidCollectorConfig struct {
 	Eventsets      []LikwidCollectorEventsetConfig `json:"eventsets"`
 	Metrics        []LikwidCollectorMetricConfig   `json:"globalmetrics,omitempty"`
@@ -64,11 +79,15 @@ type LikwidCollector struct {
 	metrics               map[C.int]map[string]int
 	groups                []C.int
 	config                LikwidCollectorConfig
-	results   map[int]map[int]map[string]interface{}
-	mresults  map[int]map[int]map[string]float64
 	gmresults             map[int]map[string]float64
 	basefreq              float64
 	running               bool
+	initialized           bool
+	likwidGroups          map[C.int]LikwidEventsetConfig
+	lock                  sync.Mutex
+	statsMeasurements     int64
+	statsProcessedMetrics int64
+	statsPublishedMetrics int64
 }
 
 type LikwidMetric struct {
@@ -86,14 +105,60 @@ func eventsToEventStr(events map[string]string) string {
 	return strings.Join(elist, ",")
 }
 
+func genLikwidEventSet(input LikwidCollectorEventsetConfig) LikwidEventsetConfig {
+	tmplist := make([]string, 0)
+	clist := make([]string, 0)
+	for k := range input.Events {
+		clist = append(clist, k)
+	}
+	sort.Strings(clist)
+	elist := make([]*C.char, 0)
+	for _, k := range clist {
+		v := input.Events[k]
+		tmplist = append(tmplist, fmt.Sprintf("%s:%s", v, k))
+		c_counter := C.CString(k)
+		elist = append(elist, c_counter)
+	}
+	estr := strings.Join(tmplist, ",")
+	res := make(map[int]map[string]interface{})
+	met := make(map[int]map[string]float64)
+	for _, i := range topo.CpuList() {
+		res[i] = make(map[string]interface{})
+		for k := range input.Events {
+			res[i][k] = 0.0
+		}
+		met[i] = make(map[string]float64)
+		for _, v := range input.Metrics {
+			res[i][v.Name] = 0.0
+		}
+	}
+	return LikwidEventsetConfig{
+		gid:     -1,
+		eorder:  elist,
+		estr:    C.CString(estr),
+		go_estr: estr,
+		results: res,
+		metrics: met,
+	}
+}
+
+func testLikwidMetricFormula(formula string, params []string) bool {
+	myparams := make(map[string]interface{})
+	for _, p := range params {
+		myparams[p] = float64(1.0)
+	}
+	_, err := agg.EvalFloat64Condition(formula, myparams)
+	return err == nil
+}
+
 func getBaseFreq() float64 {
+	files := []string{
+		"/sys/devices/system/cpu/cpu0/cpufreq/bios_limit",
+		"/sys/devices/system/cpu/cpu0/cpufreq/base_frequency",
+	}
 	var freq float64 = math.NaN()
-	C.power_init(0)
-	info := C.get_powerInfo()
-	if float64(info.baseFrequency) != 0 {
-		freq = float64(info.baseFrequency) * 1e6
-	} else {
-		buffer, err := ioutil.ReadFile("/sys/devices/system/cpu/cpu0/cpufreq/bios_limit")
+	for _, f := range files {
+		buffer, err := ioutil.ReadFile(f)
 		if err == nil {
 			data := strings.Replace(string(buffer), "\n", "", -1)
 			x, err := strconv.ParseInt(data, 0, 64)
@@ -102,12 +167,22 @@ func getBaseFreq() float64 {
 			}
 		}
 	}
+
+	if math.IsNaN(freq) {
+		C.power_init(0)
+		info := C.get_powerInfo()
+		if float64(info.baseFrequency) != 0 {
+			freq = float64(info.baseFrequency) * 1e6
+		}
+		C.power_finalize()
+	}
 	return freq
 }
 
 func (m *LikwidCollector) Init(config json.RawMessage) error {
-	var ret C.int
 	m.name = "LikwidCollector"
+	m.initialized = false
+	m.running = false
 	m.config.AccessMode = LIKWID_DEF_ACCESSMODE
 	m.config.LibraryPath = LIKWID_LIB_NAME
 	if len(config) > 0 {
@@ -131,7 +206,7 @@ func (m *LikwidCollector) Init(config json.RawMessage) error {
 	}
 	m.setup()
 
-	m.meta = map[string]string{"source": m.name, "group": "PerfCounter"}
+	m.meta = map[string]string{"group": "PerfCounter"}
 	cclog.ComponentDebug(m.name, "Get cpulist and init maps and lists")
 	cpulist := topo.CpuList()
 	m.cpulist = make([]C.int, len(cpulist))
@@ -140,172 +215,138 @@ func (m *LikwidCollector) Init(config json.RawMessage) error {
 		m.cpulist[i] = C.int(c)
 		m.cpu2tid[c] = i
 	}
-	m.sock2tid = make(map[int]int)
-	tmp := make([]C.int, 1)
-	for _, sid := range topo.SocketList() {
-		cstr := C.CString(fmt.Sprintf("S%d:0", sid))
-		ret = C.cpustr_to_cpulist(cstr, &tmp[0], 1)
-		if ret > 0 {
-			m.sock2tid[sid] = m.cpu2tid[int(tmp[0])]
-		}
-		C.free(unsafe.Pointer(cstr))
-	}
-	m.results = make(map[int]map[int]map[string]interface{})
-	m.mresults = make(map[int]map[int]map[string]float64)
+
+	m.likwidGroups = make(map[C.int]LikwidEventsetConfig)
+
+	// m.results = make(map[int]map[int]map[string]interface{})
+	// m.mresults = make(map[int]map[int]map[string]float64)
 	m.gmresults = make(map[int]map[string]float64)
-	cclog.ComponentDebug(m.name, "initialize LIKWID topology")
-	ret = C.topology_init()
-	if ret != 0 {
-		err := errors.New("failed to initialize LIKWID topology")
-		cclog.ComponentError(m.name, err.Error())
-		return err
-	}
-
-	switch m.config.AccessMode {
-	case "direct":
-		C.HPMmode(0)
-	case "accessdaemon":
-		if len(m.config.DaemonPath) > 0 {
-			p := os.Getenv("PATH")
-			os.Setenv("PATH", m.config.DaemonPath+":"+p)
-		}
-		C.HPMmode(1)
-	}
-
-	cclog.ComponentDebug(m.name, "initialize LIKWID perfmon module")
-	ret = C.perfmon_init(C.int(len(m.cpulist)), &m.cpulist[0])
-	if ret != 0 {
-		C.topology_finalize()
-		err := errors.New("failed to initialize LIKWID topology")
-		cclog.ComponentError(m.name, err.Error())
-		return err
+	for _, tid := range m.cpu2tid {
+		m.gmresults[tid] = make(map[string]float64)
 	}
 
 	// This is for the global metrics computation test
-	globalParams := make(map[string]interface{})
-	globalParams["time"] = float64(1.0)
-	globalParams["inverseClock"] = float64(1.0)
-	// While adding the events, we test the metrics whether they can be computed at all
-	for i, evset := range m.config.Eventsets {
-		var gid C.int
-		var cstr *C.char
-		if len(evset.Events) > 0 {
-			estr := eventsToEventStr(evset.Events)
+	totalMetrics := 0
 	// Generate parameter list for the metric computing test
-			params := make(map[string]interface{})
-			params["time"] = float64(1.0)
-			params["inverseClock"] = float64(1.0)
+	params := make([]string, 0)
+	params = append(params, "time", "inverseClock")
+	// Generate parameter list for the global metric computing test
+	globalParams := make([]string, 0)
+	globalParams = append(globalParams, "time", "inverseClock")
+	// We test the eventset metrics whether they can be computed at all
+	for _, evset := range m.config.Eventsets {
+		if len(evset.Events) > 0 {
+			params = params[:2]
 			for counter := range evset.Events {
-				params[counter] = float64(1.0)
+				params = append(params, counter)
 			}
 			for _, metric := range evset.Metrics {
 				// Try to evaluate the metric
-				_, err := agg.EvalFloat64Condition(metric.Calc, params)
-				if err != nil {
-					cclog.ComponentError(m.name, "Calculation for metric", metric.Name, "failed:", err.Error())
-					continue
-				}
-				// If the metric is not in the parameter list for the global metrics, add it
-				if _, ok := globalParams[metric.Name]; !ok {
-					globalParams[metric.Name] = float64(1.0)
+				if testLikwidMetricFormula(metric.Calc, params) {
+					// Add the computable metric to the parameter list for the global metrics
+					globalParams = append(globalParams, metric.Name)
+					totalMetrics++
+				} else {
+					metric.Calc = ""
 				}
 			}
-			// Now we add the list of events to likwid
-			cstr = C.CString(estr)
-			gid = C.perfmon_addEventSet(cstr)
 		} else {
 			cclog.ComponentError(m.name, "Invalid Likwid eventset config, no events given")
 			continue
 		}
-		if gid >= 0 {
-			m.groups = append(m.groups, gid)
-		}
-		C.free(unsafe.Pointer(cstr))
-		m.results[i] = make(map[int]map[string]interface{})
-		m.mresults[i] = make(map[int]map[string]float64)
-		for tid := range m.cpulist {
-			m.results[i][tid] = make(map[string]interface{})
-			m.mresults[i][tid] = make(map[string]float64)
-			if i == 0 {
-				m.gmresults[tid] = make(map[string]float64)
-			}
-		}
 	}
 	for _, metric := range m.config.Metrics {
 		// Try to evaluate the global metric
-		_, err := agg.EvalFloat64Condition(metric.Calc, globalParams)
-		if err != nil {
-			cclog.ComponentError(m.name, "Calculation for metric", metric.Name, "failed:", err.Error())
-			continue
+		if !testLikwidMetricFormula(metric.Calc, globalParams) {
+			cclog.ComponentError(m.name, "Calculation for metric", metric.Name, "failed")
+			metric.Calc = ""
+		} else {
+			totalMetrics++
 		}
 	}
 
 	// If no event set could be added, shut down LikwidCollector
-	if len(m.groups) == 0 {
-		C.perfmon_finalize()
-		C.topology_finalize()
-		err := errors.New("no LIKWID performance group initialized")
+	if totalMetrics == 0 {
+		err := errors.New("no LIKWID eventset or metric usable")
 		cclog.ComponentError(m.name, err.Error())
 		return err
 	}
-	m.basefreq = getBaseFreq()
-	cclog.ComponentDebug(m.name, "BaseFreq", m.basefreq)
+	m.statsMeasurements = 0
+	m.statsProcessedMetrics = 0
+	m.statsPublishedMetrics = 0
 	m.init = true
 	return nil
 }
 
 // take a measurement for 'interval' seconds of event set index 'group'
-func (m *LikwidCollector) takeMeasurement(group int, interval time.Duration) error {
+func (m *LikwidCollector) takeMeasurement(evset LikwidEventsetConfig, interval time.Duration) (bool, error) {
 	var ret C.int
-	gid := m.groups[group]
-	ret = C.perfmon_setupCounters(gid)
+
+	m.lock.Lock()
+	if m.initialized {
+		ret = C.perfmon_setupCounters(evset.gid)
 		if ret != 0 {
-		gctr := C.GoString(C.perfmon_getGroupName(gid))
-		err := fmt.Errorf("failed to setup performance group %d (%s)", gid, gctr)
-		return err
+			var err error = nil
+			var skip bool = false
+			if ret == -37 {
+				skip = true
+			} else {
+				err = fmt.Errorf("failed to setup performance group %d", evset.gid)
+			}
+			m.lock.Unlock()
+			return skip, err
 		}
 		ret = C.perfmon_startCounters()
 		if ret != 0 {
-		gctr := C.GoString(C.perfmon_getGroupName(gid))
-		err := fmt.Errorf("failed to start performance group %d (%s)", gid, gctr)
-		return err
+			var err error = nil
+			var skip bool = false
+			if ret == -37 {
+				skip = true
+			} else {
+				err = fmt.Errorf("failed to setup performance group %d", evset.gid)
+			}
+			m.lock.Unlock()
+			return skip, err
 		}
 		m.running = true
 		time.Sleep(interval)
 		m.running = false
 		ret = C.perfmon_stopCounters()
 		if ret != 0 {
-		gctr := C.GoString(C.perfmon_getGroupName(gid))
-		err := fmt.Errorf("failed to stop performance group %d (%s)", gid, gctr)
-		return err
+			var err error = nil
+			var skip bool = false
+			if ret == -37 {
+				skip = true
+			} else {
+				err = fmt.Errorf("failed to setup performance group %d", evset.gid)
 			}
-	return nil
+			m.lock.Unlock()
+			return skip, err
+		}
+	}
+	m.lock.Unlock()
+	m.statsMeasurements++
+	stats.ComponentStatInt(m.name, "measurements", m.statsMeasurements)
+	return false, nil
 }
 
 // Get all measurement results for an event set, derive the metric values out of the measurement results and send it
-func (m *LikwidCollector) calcEventsetMetrics(group int, interval time.Duration, output chan lp.CCMetric) error {
-	var eidx C.int
-	evset := m.config.Eventsets[group]
-	gid := m.groups[group]
+func (m *LikwidCollector) calcEventsetMetrics(evset LikwidEventsetConfig, interval time.Duration, output chan lp.CCMetric) error {
 	invClock := float64(1.0 / m.basefreq)
 
 	// Go over events and get the results
-	for eidx = 0; int(eidx) < len(evset.Events); eidx++ {
-		ctr := C.perfmon_getCounterName(gid, eidx)
-		gctr := C.GoString(ctr)
-
+	for eidx, counter := range evset.eorder {
+		gctr := C.GoString(counter)
 		for _, tid := range m.cpu2tid {
-			if tid >= 0 {
-				m.results[group][tid]["time"] = interval.Seconds()
-				m.results[group][tid]["inverseClock"] = invClock
-				res := C.perfmon_getLastResult(gid, eidx, C.int(tid))
-				m.results[group][tid][gctr] = float64(res)
-			}
+			res := C.perfmon_getLastResult(evset.gid, C.int(eidx), C.int(tid))
+			evset.results[tid][gctr] = float64(res)
+			evset.results[tid]["time"] = interval.Seconds()
+			evset.results[tid]["inverseClock"] = invClock
 		}
 	}
 
 	// Go over the event set metrics, derive the value out of the event:counter values and send it
-	for _, metric := range evset.Metrics {
+	for _, metric := range m.config.Eventsets[evset.internal].Metrics {
 		// The metric scope is determined in the Init() function
 		// Get the map scope-id -> tids
 		scopemap := m.cpu2tid
@@ -313,19 +354,21 @@ func (m *LikwidCollector) calcEventsetMetrics(group int, interval time.Duration,
 			scopemap = m.sock2tid
 		}
 		for domain, tid := range scopemap {
-			if tid >= 0 {
-				value, err := agg.EvalFloat64Condition(metric.Calc, m.results[group][tid])
+			if tid >= 0 && len(metric.Calc) > 0 {
+				value, err := agg.EvalFloat64Condition(metric.Calc, evset.results[tid])
 				if err != nil {
 					cclog.ComponentError(m.name, "Calculation for metric", metric.Name, "failed:", err.Error())
 					continue
 				}
-				m.mresults[group][tid][metric.Name] = value
+				evset.metrics[tid][metric.Name] = value
 				if m.config.InvalidToZero && math.IsNaN(value) {
 					value = 0.0
 				}
 				if m.config.InvalidToZero && math.IsInf(value, 0) {
 					value = 0.0
 				}
+				m.statsProcessedMetrics++
+				stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 				// Now we have the result, send it with the proper tags
 				if !math.IsNaN(value) {
 					if metric.Publish {
@@ -338,6 +381,8 @@ func (m *LikwidCollector) calcEventsetMetrics(group int, interval time.Duration,
 							if len(metric.Unit) > 0 {
 								y.AddMeta("unit", metric.Unit)
 							}
+							m.statsPublishedMetrics++
+							stats.ComponentStatInt(m.name, "published_metrics", m.statsPublishedMetrics)
 							output <- y
 						}
 					}
@@ -360,8 +405,8 @@ func (m *LikwidCollector) calcGlobalMetrics(interval time.Duration, output chan
 			if tid >= 0 {
 				// Here we generate parameter list
 				params := make(map[string]interface{})
-				for j := range m.groups {
-					for mname, mres := range m.mresults[j][tid] {
+				for _, evset := range m.likwidGroups {
+					for mname, mres := range evset.metrics[tid] {
 						params[mname] = mres
 					}
 				}
@@ -378,6 +423,8 @@ func (m *LikwidCollector) calcGlobalMetrics(interval time.Duration, output chan
 				if m.config.InvalidToZero && math.IsInf(value, 0) {
 					value = 0.0
 				}
+				m.statsProcessedMetrics++
+				stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 				// Now we have the result, send it with the proper tags
 				if !math.IsNaN(value) {
 					if metric.Publish {
@@ -391,6 +438,8 @@ func (m *LikwidCollector) calcGlobalMetrics(interval time.Duration, output chan
 							if len(metric.Unit) > 0 {
 								y.AddMeta("unit", metric.Unit)
 							}
+							m.statsPublishedMetrics++
+							stats.ComponentStatInt(m.name, "published_metrics", m.statsPublishedMetrics)
 							output <- y
 						}
 					}
@@ -401,38 +450,163 @@ func (m *LikwidCollector) calcGlobalMetrics(interval time.Duration, output chan
 	return nil
 }
 
+func (m *LikwidCollector) LateInit() error {
+	var ret C.int
+	if m.initialized {
+		return nil
+	}
+	switch m.config.AccessMode {
+	case "direct":
+		C.HPMmode(0)
+	case "accessdaemon":
+		if len(m.config.DaemonPath) > 0 {
+			p := os.Getenv("PATH")
+			os.Setenv("PATH", m.config.DaemonPath+":"+p)
+		}
+		C.HPMmode(1)
+	}
+	cclog.ComponentDebug(m.name, "initialize LIKWID topology")
+	ret = C.topology_init()
+	if ret != 0 {
+		err := errors.New("failed to initialize LIKWID topology")
+		cclog.ComponentError(m.name, err.Error())
+		return err
+	}
+
+	m.sock2tid = make(map[int]int)
+	tmp := make([]C.int, 1)
+	for _, sid := range topo.SocketList() {
+		cstr := C.CString(fmt.Sprintf("S%d:0", sid))
+		ret = C.cpustr_to_cpulist(cstr, &tmp[0], 1)
+		if ret > 0 {
+			m.sock2tid[sid] = m.cpu2tid[int(tmp[0])]
+		}
+		C.free(unsafe.Pointer(cstr))
+	}
+
+	m.basefreq = getBaseFreq()
+	cclog.ComponentDebug(m.name, "BaseFreq", m.basefreq)
+
+	cclog.ComponentDebug(m.name, "initialize LIKWID perfmon module")
+	ret = C.perfmon_init(C.int(len(m.cpulist)), &m.cpulist[0])
+	if ret != 0 {
+		var err error = nil
+		C.topology_finalize()
+		if ret != -22 {
+			err = errors.New("failed to initialize LIKWID perfmon")
+			cclog.ComponentError(m.name, err.Error())
+		} else {
+			err = errors.New("access to LIKWID perfmon locked")
+		}
+		return err
+	}
+
+	// While adding the events, we test the metrics whether they can be computed at all
+	for i, evset := range m.config.Eventsets {
+		var gid C.int
+		if len(evset.Events) > 0 {
+			skip := false
+			likwidGroup := genLikwidEventSet(evset)
+			for _, g := range m.likwidGroups {
+				if likwidGroup.go_estr == g.go_estr {
+					skip = true
+					break
+				}
+			}
+			if skip {
+				continue
+			}
+			// Now we add the list of events to likwid
+			gid = C.perfmon_addEventSet(likwidGroup.estr)
+			if gid >= 0 {
+				likwidGroup.gid = gid
+				likwidGroup.internal = i
+				m.likwidGroups[gid] = likwidGroup
+			}
+		} else {
+			cclog.ComponentError(m.name, "Invalid Likwid eventset config, no events given")
+			continue
+		}
+
+	}
+
+	// If no event set could be added, shut down LikwidCollector
+	if len(m.likwidGroups) == 0 {
+		C.perfmon_finalize()
+		C.topology_finalize()
+		err := errors.New("no LIKWID performance group initialized")
+		cclog.ComponentError(m.name, err.Error())
+		return err
+	}
+	sigchan := make(chan os.Signal, 1)
+	signal.Notify(sigchan, syscall.SIGCHLD)
+	signal.Notify(sigchan, os.Interrupt)
+	go func() {
+		<-sigchan
+
+		signal.Stop(sigchan)
+		m.initialized = false
+	}()
+	m.initialized = true
+	return nil
+}
+
 // main read function taking multiple measurement rounds, each 'interval' seconds long
 func (m *LikwidCollector) Read(interval time.Duration, output chan lp.CCMetric) {
+	var skip bool = false
+	var err error
 	if !m.init {
 		return
 	}
 
-	for i := range m.groups {
+	if !m.initialized {
+		m.lock.Lock()
+		err = m.LateInit()
+		if err != nil {
+			m.lock.Unlock()
+			return
+		}
+		m.initialized = true
+		m.lock.Unlock()
+	}
+
+	if m.initialized && !skip {
+		for _, evset := range m.likwidGroups {
+			if !skip {
 				// measure event set 'i' for 'interval' seconds
-		err := m.takeMeasurement(i, interval)
+				skip, err = m.takeMeasurement(evset, interval)
 				if err != nil {
 					cclog.ComponentError(m.name, err.Error())
 					return
 				}
-		// read measurements and derive event set metrics
-		m.calcEventsetMetrics(i, interval, output)
 			}
+
+			if !skip {
+				// read measurements and derive event set metrics
+				m.calcEventsetMetrics(evset, interval, output)
+			}
+		}
+		if !skip {
 			// use the event set metrics to derive the global metrics
 			m.calcGlobalMetrics(interval, output)
+		}
+	}
 }
 
 func (m *LikwidCollector) Close() {
 	if m.init {
-		cclog.ComponentDebug(m.name, "Closing ...")
 		m.init = false
-		if m.running {
-			cclog.ComponentDebug(m.name, "Stopping counters")
-			C.perfmon_stopCounters()
-		}
+		cclog.ComponentDebug(m.name, "Closing ...")
+		m.lock.Lock()
+		if m.initialized {
 			cclog.ComponentDebug(m.name, "Finalize LIKWID perfmon module")
 			C.perfmon_finalize()
+			m.initialized = false
+		}
+		m.lock.Unlock()
 		cclog.ComponentDebug(m.name, "Finalize LIKWID topology module")
 		C.topology_finalize()
+
 		cclog.ComponentDebug(m.name, "Closing done")
 	}
 }

collectors/loadavgMetric.go

@@ -10,6 +10,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 //
@@ -32,6 +33,7 @@ type LoadavgCollector struct {
 	config       struct {
 		ExcludeMetrics []string `json:"exclude_metrics,omitempty"`
 	}
+	statsProcessedMetrics int64
 }
 
 func (m *LoadavgCollector) Init(config json.RawMessage) error {
@@ -63,6 +65,7 @@ func (m *LoadavgCollector) Init(config json.RawMessage) error {
 	for i, name := range m.proc_matches {
 		_, m.proc_skips[i] = stringArrayContains(m.config.ExcludeMetrics, name)
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -98,6 +101,7 @@ func (m *LoadavgCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		y, err := lp.New(name, m.tags, m.meta, map[string]interface{}{"value": x}, now)
 		if err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 	}
 
@@ -117,9 +121,10 @@ func (m *LoadavgCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		y, err := lp.New(name, m.tags, m.meta, map[string]interface{}{"value": x}, now)
 		if err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
-
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *LoadavgCollector) Close() {

collectors/lustreMetric.go

@@ -12,6 +12,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const LUSTRE_SYSFS = `/sys/fs/lustre`
@@ -44,6 +45,7 @@ type LustreCollector struct {
 	lastTimestamp         time.Time                   // Store time stamp of last tick to derive bandwidths
 	definitions           []LustreMetricDefinition    // Combined list without excluded metrics
 	stats                 map[string]map[string]int64 // Data for last value per device and metric
+	statsProcessedMetrics int64
 }
 
 func (m *LustreCollector) getDeviceDataCommand(device string) []string {
@@ -372,6 +374,7 @@ func (m *LustreCollector) Init(config json.RawMessage) error {
 		}
 	}
 	m.lastTimestamp = time.Now()
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -418,11 +421,13 @@ func (m *LustreCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					y.AddMeta("unit", def.unit)
 				}
 				output <- y
+				m.statsProcessedMetrics++
 			}
 			devData[def.name] = use_x
 		}
 	}
 	m.lastTimestamp = now
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *LustreCollector) Close() {

collectors/memstatMetric.go

@@ -14,6 +14,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const MEMSTATFILE = "/proc/meminfo"
@@ -38,10 +39,16 @@ type MemstatCollector struct {
 	config                MemstatCollectorConfig
 	nodefiles             map[int]MemstatCollectorNode
 	sendMemUsed           bool
+	statsProcessedMetrics int64
 }
 
-func getStats(filename string) map[string]float64 {
-	stats := make(map[string]float64)
+type MemstatStats struct {
+	value float64
+	unit  string
+}
+
+func getStats(filename string) map[string]MemstatStats {
+	stats := make(map[string]MemstatStats)
 	file, err := os.Open(filename)
 	if err != nil {
 		cclog.Error(err.Error())
@@ -55,12 +62,18 @@ func getStats(filename string) map[string]float64 {
 		if len(linefields) == 3 {
 			v, err := strconv.ParseFloat(linefields[1], 64)
 			if err == nil {
-				stats[strings.Trim(linefields[0], ":")] = v
+				stats[strings.Trim(linefields[0], ":")] = MemstatStats{
+					value: v,
+					unit:  linefields[2],
+				}
 			}
 		} else if len(linefields) == 5 {
 			v, err := strconv.ParseFloat(linefields[3], 64)
 			if err == nil {
-				stats[strings.Trim(linefields[0], ":")] = v
+				stats[strings.Trim(linefields[0], ":")] = MemstatStats{
+					value: v,
+					unit:  linefields[4],
+				}
 			}
 		}
 	}
@@ -78,7 +91,7 @@ func (m *MemstatCollector) Init(config json.RawMessage) error {
 			return err
 		}
 	}
-	m.meta = map[string]string{"source": m.name, "group": "Memory", "unit": "GByte"}
+	m.meta = map[string]string{"source": m.name, "group": "Memory"}
 	m.stats = make(map[string]int64)
 	m.matches = make(map[string]string)
 	m.tags = map[string]string{"type": "node"}
@@ -142,6 +155,7 @@ func (m *MemstatCollector) Init(config json.RawMessage) error {
 			}
 		}
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return err
 }
@@ -151,30 +165,53 @@ func (m *MemstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		return
 	}
 
-	sendStats := func(stats map[string]float64, tags map[string]string) {
+	sendStats := func(stats map[string]MemstatStats, tags map[string]string) {
 		for match, name := range m.matches {
 			var value float64 = 0
+			var unit string = ""
 			if v, ok := stats[match]; ok {
-				value = v
+				value = v.value
+				if len(v.unit) > 0 {
+					unit = v.unit
 				}
-			y, err := lp.New(name, tags, m.meta, map[string]interface{}{"value": value * 1e-6}, time.Now())
+			}
+
+			y, err := lp.New(name, tags, m.meta, map[string]interface{}{"value": value}, time.Now())
 			if err == nil {
+				if len(unit) > 0 {
+					y.AddMeta("unit", unit)
+				}
+				m.statsProcessedMetrics++
 				output <- y
 			}
 		}
 		if m.sendMemUsed {
 			memUsed := 0.0
+			unit := ""
 			if totalVal, total := stats["MemTotal"]; total {
 				if freeVal, free := stats["MemFree"]; free {
 					if bufVal, buffers := stats["Buffers"]; buffers {
 						if cacheVal, cached := stats["Cached"]; cached {
-							memUsed = totalVal - (freeVal + bufVal + cacheVal)
+							memUsed = totalVal.value - (freeVal.value + bufVal.value + cacheVal.value)
+							if len(totalVal.unit) > 0 {
+								unit = totalVal.unit
+							} else if len(freeVal.unit) > 0 {
+								unit = freeVal.unit
+							} else if len(bufVal.unit) > 0 {
+								unit = bufVal.unit
+							} else if len(cacheVal.unit) > 0 {
+								unit = cacheVal.unit
 							}
 						}
 					}
 				}
-			y, err := lp.New("mem_used", tags, m.meta, map[string]interface{}{"value": memUsed * 1e-6}, time.Now())
+			}
+			y, err := lp.New("mem_used", tags, m.meta, map[string]interface{}{"value": memUsed}, time.Now())
 			if err == nil {
+				if len(unit) > 0 {
+					y.AddMeta("unit", unit)
+				}
+				m.statsProcessedMetrics++
 				output <- y
 			}
 		}
@@ -191,6 +228,7 @@ func (m *MemstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 			sendStats(stats, nodeConf.tags)
 		}
 	}
+	stats.ComponentStatInt(m.name, "collected_metrics", m.statsProcessedMetrics)
 }
 
 func (m *MemstatCollector) Close() {

collectors/netstatMetric.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const NETSTATFILE = "/proc/net/dev"
@@ -35,6 +36,7 @@ type NetstatCollector struct {
 	config                NetstatCollectorConfig
 	matches               map[string][]NetstatCollectorMetric
 	lastTimestamp         time.Time
+	statsProcessedMetrics int64
 }
 
 func (m *NetstatCollector) Init(config json.RawMessage) error {
@@ -148,6 +150,7 @@ func (m *NetstatCollector) Init(config json.RawMessage) error {
 	if len(m.matches) == 0 {
 		return errors.New("no devices to collector metrics found")
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -198,6 +201,7 @@ func (m *NetstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if m.config.SendAbsoluteValues {
 					if y, err := lp.New(metric.name, metric.tags, metric.meta, map[string]interface{}{"value": v}, now); err == nil {
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 				if m.config.SendDerivedValues {
@@ -205,6 +209,7 @@ func (m *NetstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 						rate := float64(v-metric.lastValue) / timeDiff
 						if y, err := lp.New(metric.name+"_bw", metric.tags, metric.meta_rates, map[string]interface{}{"value": rate}, now); err == nil {
 							output <- y
+							m.statsProcessedMetrics++
 						}
 					}
 					metric.lastValue = v
@@ -212,6 +217,7 @@ func (m *NetstatCollector) Read(interval time.Duration, output chan lp.CCMetric)
 			}
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *NetstatCollector) Close() {

collectors/nfsMetric.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 // First part contains the code for the general NfsCollector.
@@ -33,10 +34,11 @@ type nfsCollector struct {
 		ExcludeMetrics []string `json:"exclude_metrics,omitempty"`
 	}
 	data                  map[string]NfsCollectorData
+	statsProcessedMetrics int64
 }
 
 func (m *nfsCollector) initStats() error {
-	cmd := exec.Command(m.config.Nfsstats, `-l`)
+	cmd := exec.Command(m.config.Nfsstats, `-l`, `--all`)
 	cmd.Wait()
 	buffer, err := cmd.Output()
 	if err == nil {
@@ -52,7 +54,7 @@ func (m *nfsCollector) initStats() error {
 					if err == nil {
 						x := m.data[name]
 						x.current = value
-						x.last = 0
+						x.last = value
 						m.data[name] = x
 					}
 				}
@@ -63,7 +65,7 @@ func (m *nfsCollector) initStats() error {
 }
 
 func (m *nfsCollector) updateStats() error {
-	cmd := exec.Command(m.config.Nfsstats, `-l`)
+	cmd := exec.Command(m.config.Nfsstats, `-l`, `--all`)
 	cmd.Wait()
 	buffer, err := cmd.Output()
 	if err == nil {
@@ -113,6 +115,7 @@ func (m *nfsCollector) MainInit(config json.RawMessage) error {
 	}
 	m.data = make(map[string]NfsCollectorData)
 	m.initStats()
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -143,8 +146,10 @@ func (m *nfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		if err == nil {
 			y.AddMeta("version", m.version)
 			output <- y
+			m.statsProcessedMetrics++
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *nfsCollector) Close() {

collectors/numastatsMetric.go

@@ -12,6 +12,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 //
@@ -45,6 +46,7 @@ type NUMAStatsCollectorTopolgy struct {
 type NUMAStatsCollector struct {
 	metricCollector
 	topology              []NUMAStatsCollectorTopolgy
+	statsProcessedMetrics int64
 }
 
 func (m *NUMAStatsCollector) Init(config json.RawMessage) error {
@@ -80,7 +82,7 @@ func (m *NUMAStatsCollector) Init(config json.RawMessage) error {
 				tagSet: map[string]string{"memoryDomain": node},
 			})
 	}
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -127,11 +129,13 @@ func (m *NUMAStatsCollector) Read(interval time.Duration, output chan lp.CCMetri
 			)
 			if err == nil {
 				output <- y
+				m.statsProcessedMetrics++
 			}
 		}
 
 		file.Close()
 	}
+	stats.ComponentStatInt(m.name, "collected_metrics", m.statsProcessedMetrics)
 }
 
 func (m *NUMAStatsCollector) Close() {

collectors/nvidiaMetric.go

@@ -9,6 +9,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"github.com/NVIDIA/go-nvml/pkg/nvml"
 )
 
@@ -29,6 +30,7 @@ type NvidiaCollector struct {
 	num_gpus              int
 	config                NvidiaCollectorConfig
 	gpus                  []NvidiaCollectorDevice
+	statsProcessedMetrics int64
 }
 
 func (m *NvidiaCollector) CatchPanic() {
@@ -120,7 +122,7 @@ func (m *NvidiaCollector) Init(config json.RawMessage) error {
 				pciInfo.Device)
 		}
 	}
-
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -151,6 +153,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					if err == nil {
 						y.AddMeta("unit", "%")
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 				if !device.excludeMetrics["nv_mem_util"] {
@@ -158,6 +161,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					if err == nil {
 						y.AddMeta("unit", "%")
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 			}
@@ -186,6 +190,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					if err == nil {
 						y.AddMeta("unit", "MByte")
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 
@@ -195,6 +200,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 					if err == nil {
 						y.AddMeta("unit", "MByte")
 						output <- y
+						m.statsProcessedMetrics++
 					}
 				}
 			}
@@ -212,6 +218,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "degC")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -232,6 +239,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "%")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -258,11 +266,13 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				}
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			} else if ret == nvml.ERROR_NOT_SUPPORTED {
 				y, err := lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": "N/A"}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -280,6 +290,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				y, err := lp.New("nv_perf_state", device.tags, m.meta, map[string]interface{}{"value": fmt.Sprintf("P%d", int(pState))}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -296,6 +307,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "watts")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -313,6 +325,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -324,6 +337,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -335,6 +349,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -357,6 +372,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -368,6 +384,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -379,6 +396,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "MHz")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -398,6 +416,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				y, err := lp.New("nv_ecc_db_error", device.tags, m.meta, map[string]interface{}{"value": float64(ecc_db)}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -408,6 +427,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				y, err := lp.New("nv_ecc_sb_error", device.tags, m.meta, map[string]interface{}{"value": float64(ecc_sb)}, time.Now())
 				if err == nil {
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -425,6 +445,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "watts")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -441,6 +462,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "%")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
@@ -457,11 +479,12 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 				if err == nil {
 					y.AddMeta("unit", "%")
 					output <- y
+					m.statsProcessedMetrics++
 				}
 			}
 		}
 	}
-
+	stats.ComponentStatInt(m.name, "collected_metrics", m.statsProcessedMetrics)
 }
 
 func (m *NvidiaCollector) Close() {

collectors/sampleMetric.go

@@ -6,6 +6,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 // These are the fields we read from the JSON configuration
@@ -20,6 +21,7 @@ type SampleCollector struct {
 	config     SampleTimerCollectorConfig // the configuration structure
 	meta       map[string]string          // default meta information
 	tags       map[string]string          // default tags
+	statsCount int64
 }
 
 // Functions to implement MetricCollector interface
@@ -58,6 +60,9 @@ func (m *SampleCollector) Init(config json.RawMessage) error {
 	// for all topological entities (sockets, NUMA domains, ...)
 	// Return some useful error message in case of any failures
 
+	// Initialize counts for statistics
+	m.statsCount = 0
+
 	// Set this flag only if everything is initialized properly, all required files exist, ...
 	m.init = true
 	return err
@@ -80,8 +85,11 @@ func (m *SampleCollector) Read(interval time.Duration, output chan lp.CCMetric)
 	if err == nil {
 		// Send it to output channel
 		output <- y
+		// increment count for each sent metric or any other operation
+		m.statsCount++
 	}
-
+	// Set stats for the component
+	stats.ComponentStatInt(m.name, "count", m.statsCount)
 }
 
 // Close metric collector: close network connection, close files, close libraries, ...

collectors/tempMetric.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 // See: https://www.kernel.org/doc/html/latest/hwmon/sysfs-interface.html
@@ -41,6 +42,7 @@ type TempCollector struct {
 		ReportCriticalTemp bool                         `json:"report_critical_temperature"`
 	}
 	sensors               []*TempCollectorSensor
+	statsProcessedMetrics int64
 }
 
 func (m *TempCollector) Init(config json.RawMessage) error {
@@ -162,6 +164,7 @@ func (m *TempCollector) Init(config json.RawMessage) error {
 	}
 
 	// Finished initialization
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -194,6 +197,7 @@ func (m *TempCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 		)
 		if err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 
 		// max temperature
@@ -207,6 +211,7 @@ func (m *TempCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 			)
 			if err == nil {
 				output <- y
+				m.statsProcessedMetrics++
 			}
 		}
 
@@ -221,10 +226,11 @@ func (m *TempCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 			)
 			if err == nil {
 				output <- y
+				m.statsProcessedMetrics++
 			}
 		}
 	}
-
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *TempCollector) Close() {

collectors/topprocsMetric.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const MAX_NUM_PROCS = 10
@@ -23,6 +24,7 @@ type TopProcsCollector struct {
 	metricCollector
 	tags                  map[string]string
 	config                TopProcsCollectorConfig
+	statsProcessedMetrics int64
 }
 
 func (m *TopProcsCollector) Init(config json.RawMessage) error {
@@ -48,6 +50,7 @@ func (m *TopProcsCollector) Init(config json.RawMessage) error {
 	if err != nil {
 		return errors.New("failed to execute command")
 	}
+	m.statsProcessedMetrics = 0
 	m.init = true
 	return nil
 }
@@ -70,8 +73,10 @@ func (m *TopProcsCollector) Read(interval time.Duration, output chan lp.CCMetric
 		y, err := lp.New(name, m.tags, m.meta, map[string]interface{}{"value": string(lines[i])}, time.Now())
 		if err == nil {
 			output <- y
+			m.statsProcessedMetrics++
 		}
 	}
+	stats.ComponentStatInt(m.name, "processed_metrics", m.statsProcessedMetrics)
 }
 
 func (m *TopProcsCollector) Close() {

internal/ccTopology/ccTopology.go

@@ -169,7 +169,10 @@ func DieList() []int {
 			}
 		}
 	}
+	if len(dielist) > 0 {
 		return dielist
+	}
+	return SocketList()
 }
 
 type CpuEntry struct {
@@ -261,7 +264,7 @@ func CpuData() []CpuEntry {
 	for _, c := range CpuList() {
 		clist = append(clist, CpuEntry{Cpuid: c})
 	}
-	for _, centry := range clist {
+	for i, centry := range clist {
 		centry.Socket = -1
 		centry.Numadomain = -1
 		centry.Die = -1
@@ -289,6 +292,8 @@ func CpuData() []CpuEntry {
 		// Lookup NUMA domain id
 		centry.Numadomain = getNumaDomain(base)
 
+		// Update values in output list
+		clist[i] = centry
 	}
 	return clist
 }

internal/metricRouter/README.md

@@ -8,6 +8,8 @@ The CCMetric router sits in between the collectors and the sinks and can be used
 {
     "num_cache_intervals" : 1,
     "interval_timestamp" : true,
+    "hostname_tag" : "hostname",
+    "max_forward" : 50,
     "add_tags" : [
         {
             "key" : "cluster",
@@ -55,6 +57,20 @@ The CCMetric router sits in between the collectors and the sinks and can be used
 ```
 
 There are three main options `add_tags`, `delete_tags` and `interval_timestamp`. `add_tags` and `delete_tags` are lists consisting of dicts with `key`, `value` and `if`. The `value` can be omitted in the `delete_tags` part as it only uses the `key` for removal. The `interval_timestamp` setting means that a unique timestamp is applied to all metrics traversing the router during an interval.
+
+# Processing order in the router
+
+- Add the `hostname_tag` tag (if sent by collectors or cache)
+- If `interval_timestamp == true`, change time of metrics
+- Check if metric should be dropped (`drop_metrics` and `drop_metrics_if`)
+- Add tags from `add_tags`
+- Delete tags from `del_tags`
+- Rename metric based on `rename_metrics` and store old name as `oldname` in meta information
+- Add tags from `add_tags` (if you used the new name in the `if` condition)
+- Delete tags from `del_tags` (if you used the new name in the `if` condition)
+- Send to sinks
+- Move to cache (if `num_cache_intervals > 0`)
+
 # The `interval_timestamp` option
 
 The collectors' `Read()` functions are not called simultaneously and therefore the metrics gathered in an interval can have different timestamps. If you want to avoid that and have a common timestamp (the beginning of the interval), set this option to `true` and the MetricRouter sets the time.
@@ -65,6 +81,14 @@ If the MetricRouter should buffer metrics of intervals in a MetricCache, this op
 
 A `num_cache_intervals > 0` is required to use the `interval_aggregates` option.
 
+# The `hostname_tag` option
+
+By default, the router tags metrics with the hostname for all locally created metrics. The default tag name is `hostname`, but it can be changed if your organization wants anything else
+
+# The `max_forward` option
+
+Every time the router receives a metric through any of the channels, it tries to directly read up to `max_forward` metrics from the same channel. This was done as the router thread would go to sleep and wake up with every arriving metric. The default are `50` metrics at once and `max_forward` needs to greater than `1`.
+
 # The `rename_metrics` option
 
 In the ClusterCockpit world we specified a set of standard metrics. Since some collectors determine the metric names based on files, execuables and libraries, they might change from system to system (or installation to installtion, OS to OS, ...). In order to get the common names, you can rename incoming metrics before sending them to the sink. If the metric name matches the `oldname`, it is changed to `newname`

internal/metricRouter/StatsApi.md

@@ -0,0 +1,17 @@
+# Stats API
+
+The Stats API can be used for debugging. It publishes counts at an HTTP endpoint as JSON from different componenets of the CC Metric Collector.
+
+# Configuration
+
+The Stats API has an own configuration file to specify the listen host and port. The defaults are `localhost` and `8080`.
+
+```json
+{
+  "bindhost" : "",
+  "port" : "8080",
+  "publish_collectorstate" : true
+}
+```
+
+The `bindhost` and `port` can be used to specify the listen host and port. The `publish_collectorstate` needs to be `true`, otherwise nothing is presented. This option is for future use if we need to publish more infos using different domains.

internal/metricRouter/metricApi.go

@@ -0,0 +1,232 @@
+package metricRouter
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"sync"
+	"time"
+
+	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
+	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	mct "github.com/ClusterCockpit/cc-metric-collector/internal/multiChanTicker"
+	"github.com/gorilla/mux"
+)
+
+type statsApiConfig struct {
+	PublishCollectorState bool   `json:"publish_collectorstate"`
+	Host                  string `json:"bindhost"`
+	Port                  string `json:"port"`
+}
+
+// Metric cache data structure
+type statsApi struct {
+	name     string
+	input    chan lp.CCMetric
+	indone   chan bool
+	outdone  chan bool
+	config   statsApiConfig
+	wg       *sync.WaitGroup
+	statsWg  sync.WaitGroup
+	ticker   mct.MultiChanTicker
+	tickchan chan time.Time
+	server   *http.Server
+	router   *mux.Router
+	lock     sync.Mutex
+	baseurl  string
+	stats    map[string]map[string]int64
+	outStats map[string]map[string]int64
+}
+
+type StatsApi interface {
+	Start()
+	Close()
+	StatsFunc(w http.ResponseWriter, r *http.Request)
+}
+
+var statsApiServer *statsApi = nil
+
+func (a *statsApi) updateStats(point lp.CCMetric) {
+	switch point.Name() {
+	case "_stats":
+		if name, nok := point.GetMeta("source"); nok {
+			var compStats map[string]int64
+			var ok bool
+
+			if compStats, ok = a.stats[name]; !ok {
+				a.stats[name] = make(map[string]int64)
+				compStats = a.stats[name]
+			}
+			for k, v := range point.Fields() {
+				switch value := v.(type) {
+				case int:
+					compStats[k] = int64(value)
+				case uint:
+					compStats[k] = int64(value)
+				case int32:
+					compStats[k] = int64(value)
+				case uint32:
+					compStats[k] = int64(value)
+				case int64:
+					compStats[k] = int64(value)
+				case uint64:
+					compStats[k] = int64(value)
+				default:
+					cclog.ComponentDebug(a.name, "Unusable stats for", k, ". Values should be int64")
+				}
+			}
+			a.stats[name] = compStats
+		}
+	}
+}
+
+func (a *statsApi) Start() {
+	a.ticker.AddChannel(a.tickchan)
+	a.wg.Add(1)
+	a.statsWg.Add(1)
+	go func() {
+		a.stats = make(map[string]map[string]int64)
+		defer a.statsWg.Done()
+		for {
+			select {
+			case <-a.indone:
+				cclog.ComponentDebug(a.name, "INPUT DONE")
+				close(a.indone)
+				return
+			case p := <-a.input:
+				a.lock.Lock()
+				a.updateStats(p)
+				a.lock.Unlock()
+			}
+		}
+	}()
+	a.statsWg.Add(1)
+	go func() {
+		a.outStats = make(map[string]map[string]int64)
+		defer a.statsWg.Done()
+		a.lock.Lock()
+		for comp, compData := range a.stats {
+			var outData map[string]int64
+			var ok bool
+			if outData, ok = a.outStats[comp]; !ok {
+				outData = make(map[string]int64)
+			}
+			for k, v := range compData {
+				outData[k] = v
+			}
+			a.outStats[comp] = outData
+		}
+		a.lock.Unlock()
+		for {
+			select {
+			case <-a.outdone:
+				cclog.ComponentDebug(a.name, "OUTPUT DONE")
+				close(a.outdone)
+				return
+			case <-a.tickchan:
+				a.lock.Lock()
+				for comp, compData := range a.stats {
+					var outData map[string]int64
+					var ok bool
+					if outData, ok = a.outStats[comp]; !ok {
+						outData = make(map[string]int64)
+					}
+					for k, v := range compData {
+						outData[k] = v
+					}
+					a.outStats[comp] = outData
+				}
+				a.lock.Unlock()
+			}
+		}
+	}()
+	a.statsWg.Add(1)
+	go func() {
+		defer a.statsWg.Done()
+		err := a.server.ListenAndServe()
+		if err != nil && err.Error() != "http: Server closed" {
+			cclog.ComponentError(a.name, err.Error())
+		}
+		cclog.ComponentDebug(a.name, "SERVER DONE")
+	}()
+	cclog.ComponentDebug(a.name, "STARTED")
+}
+
+func (a *statsApi) StatsFunc(w http.ResponseWriter, r *http.Request) {
+	data, err := json.Marshal(a.outStats)
+	if err == nil {
+		w.Header().Set("Content-Type", "application/json")
+		io.WriteString(w, string(data))
+	}
+}
+
+// Close finishes / stops the metric cache
+func (a *statsApi) Close() {
+	cclog.ComponentDebug(a.name, "CLOSE")
+	a.indone <- true
+	a.outdone <- true
+	a.server.Shutdown(context.Background())
+	// wait for close of channel r.done
+	<-a.indone
+	<-a.outdone
+	a.statsWg.Wait()
+	a.wg.Done()
+
+	//a.wg.Wait()
+}
+
+func NewStatsApi(ticker mct.MultiChanTicker, wg *sync.WaitGroup, statsApiConfigfile string) (StatsApi, error) {
+	a := new(statsApi)
+	a.name = "StatsApi"
+	a.config.Host = "localhost"
+	a.config.Port = "8080"
+	configFile, err := os.Open(statsApiConfigfile)
+	if err != nil {
+		cclog.ComponentError(a.name, err.Error())
+		return nil, err
+	}
+	defer configFile.Close()
+	jsonParser := json.NewDecoder(configFile)
+	err = jsonParser.Decode(&a.config)
+	if err != nil {
+		cclog.ComponentError(a.name, err.Error())
+		return nil, err
+	}
+	a.input = make(chan lp.CCMetric)
+	a.ticker = ticker
+	a.tickchan = make(chan time.Time)
+	a.wg = wg
+	a.indone = make(chan bool)
+	a.outdone = make(chan bool)
+	a.router = mux.NewRouter()
+	a.baseurl = fmt.Sprintf("%s:%s", a.config.Host, a.config.Port)
+	a.server = &http.Server{Addr: a.baseurl, Handler: a.router}
+	if a.config.PublishCollectorState {
+		a.router.HandleFunc("/", a.StatsFunc)
+	}
+	statsApiServer = a
+	return a, nil
+}
+
+func ComponentStatInt(component string, key string, value int64) {
+	if statsApiServer == nil {
+		return
+	}
+	y, err := lp.New("_stats", map[string]string{}, map[string]string{"source": component}, map[string]interface{}{key: value}, time.Now())
+	if err == nil {
+		statsApiServer.input <- y
+	}
+}
+
+func ComponentStatString(component string, key string, value int64) {
+	if statsApiServer == nil {
+		return
+	}
+	y, err := lp.New("_stats", map[string]string{}, map[string]string{"source": component}, map[string]interface{}{key: value}, time.Now())
+	if err == nil {
+		statsApiServer.input <- y
+	}
+}

internal/metricRouter/metricRouter.go

@@ -54,6 +54,12 @@ type metricRouter struct {
 	cache             MetricCache         // pointer to MetricCache
 	cachewg           sync.WaitGroup      // wait group for MetricCache
 	maxForward        int                 // number of metrics to forward maximally in one iteration
+	statsCollForward  int64
+	statsRecvForward  int64
+	statsCacheForward int64
+	statsTotalForward int64
+	statsDropped      int64
+	statsRenamed      int64
 }
 
 // MetricRouter access functions
@@ -103,7 +109,10 @@ func (r *metricRouter) Init(ticker mct.MultiChanTicker, wg *sync.WaitGroup, rout
 		cclog.ComponentError("MetricRouter", err.Error())
 		return err
 	}
+	r.maxForward = 1
+	if r.config.MaxForward > r.maxForward {
 		r.maxForward = r.config.MaxForward
+	}
 	if r.config.NumCacheIntervals > 0 {
 		r.cache, err = NewCache(r.cache_input, r.ticker, &r.cachewg, r.config.NumCacheIntervals)
 		if err != nil {
@@ -118,6 +127,12 @@ func (r *metricRouter) Init(ticker mct.MultiChanTicker, wg *sync.WaitGroup, rout
 	for _, mname := range r.config.DropMetrics {
 		r.config.dropMetrics[mname] = true
 	}
+	r.statsCollForward = 0
+	r.statsRecvForward = 0
+	r.statsCacheForward = 0
+	r.statsTotalForward = 0
+	r.statsDropped = 0
+	r.statsRenamed = 0
 	return nil
 }
 
@@ -137,6 +152,7 @@ func (r *metricRouter) StartTimer() {
 				cclog.ComponentDebug("MetricRouter", "TIMER DONE")
 				return
 			case t := <-m:
+				cclog.ComponentDebug("MetricRouter", "INTERVAL_TICK", t.Unix())
 				r.timestamp = t
 			}
 		}
@@ -250,6 +266,8 @@ func (r *metricRouter) Start() {
 		r.DoDelTags(point)
 		name := point.Name()
 		if new, ok := r.config.RenameMetrics[name]; ok {
+			r.statsRenamed++
+			ComponentStatInt("MetricRouter", "renamed", r.statsRenamed)
 			point.SetName(new)
 			point.AddMeta("oldname", name)
 		}
@@ -269,7 +287,14 @@ func (r *metricRouter) Start() {
 			p.SetTime(r.timestamp)
 		}
 		if !r.dropMetric(p) {
+			r.statsCollForward++
+			r.statsTotalForward++
+			ComponentStatInt("MetricRouter", "collector_forward", r.statsCollForward)
+			ComponentStatInt("MetricRouter", "total_forward", r.statsTotalForward)
 			forward(p)
+		} else {
+			r.statsDropped++
+			ComponentStatInt("MetricRouter", "dropped", r.statsDropped)
 		}
 		// even if the metric is dropped, it is stored in the cache for
 		// aggregations
@@ -285,7 +310,14 @@ func (r *metricRouter) Start() {
 			p.SetTime(r.timestamp)
 		}
 		if !r.dropMetric(p) {
+			r.statsRecvForward++
+			r.statsTotalForward++
+			ComponentStatInt("MetricRouter", "receiver_forward", r.statsRecvForward)
+			ComponentStatInt("MetricRouter", "total_forward", r.statsTotalForward)
 			forward(p)
+		} else {
+			r.statsDropped++
+			ComponentStatInt("MetricRouter", "dropped", r.statsDropped)
 		}
 	}
 
@@ -294,7 +326,14 @@ func (r *metricRouter) Start() {
 		// receive from metric collector
 		if !r.dropMetric(p) {
 			p.AddTag(r.config.HostnameTagName, r.hostname)
+			r.statsCacheForward++
+			r.statsTotalForward++
+			ComponentStatInt("MetricRouter", "cache_forward", r.statsCacheForward)
+			ComponentStatInt("MetricRouter", "total_forward", r.statsTotalForward)
 			forward(p)
+		} else {
+			r.statsDropped++
+			ComponentStatInt("MetricRouter", "dropped", r.statsDropped)
 		}
 	}
 

sinks/gangliaSink.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 const GMETRIC_EXEC = `gmetric`
@@ -32,6 +33,7 @@ type GangliaSink struct {
 	gmetric_path     string
 	gmetric_config   string
 	config           GangliaSinkConfig
+	statsSentMetrics int64
 }
 
 func (s *GangliaSink) Write(point lp.CCMetric) error {
@@ -78,6 +80,8 @@ func (s *GangliaSink) Write(point lp.CCMetric) error {
 	command := exec.Command(s.gmetric_path, argstr...)
 	command.Wait()
 	_, err = command.Output()
+	s.statsSentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
 	return err
 }
 
@@ -120,5 +124,6 @@ func NewGangliaSink(name string, config json.RawMessage) (Sink, error) {
 	if len(s.config.GmetricConfig) > 0 {
 		s.gmetric_config = s.config.GmetricConfig
 	}
+	s.statsSentMetrics = 0
 	return s, nil
 }

sinks/httpSink.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	influx "github.com/influxdata/line-protocol"
 )
 
@@ -36,19 +37,21 @@ type HttpSink struct {
 	idleConnTimeout time.Duration
 	timeout         time.Duration
 	flushDelay      time.Duration
+	statsProcessed  int64
+	statsFlushes    int64
 }
 
 func (s *HttpSink) Write(m lp.CCMetric) error {
 	if s.buffer.Len() == 0 && s.flushDelay != 0 {
 		// This is the first write since the last flush, start the flushTimer!
 		if s.flushTimer != nil && s.flushTimer.Stop() {
-			cclog.ComponentDebug("HttpSink", "unexpected: the flushTimer was already running?")
+			cclog.ComponentDebug(s.name, "unexpected: the flushTimer was already running?")
 		}
 
 		// Run a batched flush for all lines that have arrived in the last second
 		s.flushTimer = time.AfterFunc(s.flushDelay, func() {
 			if err := s.Flush(); err != nil {
-				cclog.ComponentError("HttpSink", "flush failed:", err.Error())
+				cclog.ComponentError(s.name, "flush failed:", err.Error())
 			}
 		})
 	}
@@ -60,8 +63,11 @@ func (s *HttpSink) Write(m lp.CCMetric) error {
 	s.lock.Unlock() // defer does not work here as Flush() takes the lock as well
 
 	if err != nil {
+		cclog.ComponentError(s.name, "encoding failed:", err.Error())
 		return err
 	}
+	s.statsProcessed++
+	stats.ComponentStatInt(s.name, "processed_metrics", s.statsProcessed)
 
 	// Flush synchronously if "flush_delay" is zero
 	if s.flushDelay == 0 {
@@ -84,6 +90,7 @@ func (s *HttpSink) Flush() error {
 	// Create new request to send buffer
 	req, err := http.NewRequest(http.MethodPost, s.config.URL, s.buffer)
 	if err != nil {
+		cclog.ComponentError(s.name, "failed to create request:", err.Error())
 		return err
 	}
 
@@ -100,13 +107,18 @@ func (s *HttpSink) Flush() error {
 
 	// Handle transport/tcp errors
 	if err != nil {
+		cclog.ComponentError(s.name, "transport/tcp error:", err.Error())
 		return err
 	}
 
 	// Handle application errors
 	if res.StatusCode != http.StatusOK {
-		return errors.New(res.Status)
+		err = errors.New(res.Status)
+		cclog.ComponentError(s.name, "application error:", err.Error())
+		return err
 	}
+	s.statsFlushes++
+	stats.ComponentStatInt(s.name, "flushes", s.statsFlushes)
 
 	return nil
 }
@@ -114,7 +126,7 @@ func (s *HttpSink) Flush() error {
 func (s *HttpSink) Close() {
 	s.flushTimer.Stop()
 	if err := s.Flush(); err != nil {
-		cclog.ComponentError("HttpSink", "flush failed:", err.Error())
+		cclog.ComponentError(s.name, "flush failed:", err.Error())
 	}
 	s.client.CloseIdleConnections()
 }
@@ -172,5 +184,7 @@ func NewHttpSink(name string, config json.RawMessage) (Sink, error) {
 	s.buffer = &bytes.Buffer{}
 	s.encoder = influx.NewEncoder(s.buffer)
 	s.encoder.SetPrecision(time.Second)
+	s.statsFlushes = 0
+	s.statsProcessed = 0
 	return s, nil
 }

sinks/influxAsyncSink.go

@@ -10,6 +10,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	influxdb2 "github.com/influxdata/influxdb-client-go/v2"
 	influxdb2Api "github.com/influxdata/influxdb-client-go/v2/api"
 )
@@ -28,10 +29,10 @@ type InfluxAsyncSinkConfig struct {
 	BatchSize uint `json:"batch_size,omitempty"`
 	// Interval, in ms, in which is buffer flushed if it has not been already written (by reaching batch size) . Default 1000ms
 	FlushInterval         uint   `json:"flush_interval,omitempty"`
-	InfluxRetryInterval   string `json:"retry_interval"`
-	InfluxExponentialBase uint   `json:"retry_exponential_base"`
-	InfluxMaxRetries      uint   `json:"max_retries"`
-	InfluxMaxRetryTime    string `json:"max_retry_time"`
+	InfluxRetryInterval   string `json:"retry_interval,omitempty"`
+	InfluxExponentialBase uint   `json:"retry_exponential_base,omitempty"`
+	InfluxMaxRetries      uint   `json:"max_retries,omitempty"`
+	InfluxMaxRetryTime    string `json:"max_retry_time,omitempty"`
 }
 
 type InfluxAsyncSink struct {
@@ -42,6 +43,9 @@ type InfluxAsyncSink struct {
 	config              InfluxAsyncSinkConfig
 	influxRetryInterval uint
 	influxMaxRetryTime  uint
+	sentMetrics         int64
+	statsFlushes        int64
+	statsErrors         int64
 }
 
 func (s *InfluxAsyncSink) connect() error {
@@ -60,20 +64,34 @@ func (s *InfluxAsyncSink) connect() error {
 	cclog.ComponentDebug(s.name, "Using URI", uri, "Org", s.config.Organization, "Bucket", s.config.Database)
 	clientOptions := influxdb2.DefaultOptions()
 	if s.config.BatchSize != 0 {
+		cclog.ComponentDebug(s.name, "Batch size", s.config.BatchSize)
 		clientOptions.SetBatchSize(s.config.BatchSize)
 	}
 	if s.config.FlushInterval != 0 {
+		cclog.ComponentDebug(s.name, "Flush interval", s.config.FlushInterval)
 		clientOptions.SetFlushInterval(s.config.FlushInterval)
 	}
+	if s.influxRetryInterval != 0 {
+		cclog.ComponentDebug(s.name, "MaxRetryInterval", s.influxRetryInterval)
+		clientOptions.SetMaxRetryInterval(s.influxRetryInterval)
+	}
+	if s.influxMaxRetryTime != 0 {
+		cclog.ComponentDebug(s.name, "MaxRetryTime", s.influxMaxRetryTime)
+		clientOptions.SetMaxRetryTime(s.influxMaxRetryTime)
+	}
+	if s.config.InfluxExponentialBase != 0 {
+		cclog.ComponentDebug(s.name, "Exponential Base", s.config.InfluxExponentialBase)
+		clientOptions.SetExponentialBase(s.config.InfluxExponentialBase)
+	}
+	if s.config.InfluxMaxRetries != 0 {
+		cclog.ComponentDebug(s.name, "Max Retries", s.config.InfluxMaxRetries)
+		clientOptions.SetMaxRetries(s.config.InfluxMaxRetries)
+	}
 	clientOptions.SetTLSConfig(
 		&tls.Config{
 			InsecureSkipVerify: true,
 		},
-	)
-	clientOptions.SetMaxRetryInterval(s.influxRetryInterval)
-	clientOptions.SetMaxRetryTime(s.influxMaxRetryTime)
-	clientOptions.SetExponentialBase(s.config.InfluxExponentialBase)
-	clientOptions.SetMaxRetries(s.config.InfluxMaxRetries)
+	).SetPrecision(time.Second)
 
 	s.client = influxdb2.NewClientWithOptions(uri, auth, clientOptions)
 	s.writeApi = s.client.WriteAPI(s.config.Organization, s.config.Database)
@@ -91,11 +109,15 @@ func (s *InfluxAsyncSink) Write(m lp.CCMetric) error {
 	s.writeApi.WritePoint(
 		m.ToPoint(s.meta_as_tags),
 	)
+	s.sentMetrics++
+	stats.ComponentStatInt(s.name, "send_metrics", s.sentMetrics)
 	return nil
 }
 
 func (s *InfluxAsyncSink) Flush() error {
 	s.writeApi.Flush()
+	s.statsFlushes++
+	stats.ComponentStatInt(s.name, "flushes", s.statsFlushes)
 	return nil
 }
 
@@ -110,13 +132,14 @@ func NewInfluxAsyncSink(name string, config json.RawMessage) (Sink, error) {
 	s.name = fmt.Sprintf("InfluxSink(%s)", name)
 
 	// Set default for maximum number of points sent to server in single request.
-	s.config.BatchSize = 100
-	s.influxRetryInterval = uint(time.Duration(1) * time.Second)
-	s.config.InfluxRetryInterval = "1s"
-	s.influxMaxRetryTime = uint(7 * time.Duration(24) * time.Hour)
-	s.config.InfluxMaxRetryTime = "168h"
-	s.config.InfluxMaxRetries = 20
-	s.config.InfluxExponentialBase = 2
+	s.config.BatchSize = 0
+	s.influxRetryInterval = 0
+	//s.config.InfluxRetryInterval = "1s"
+	s.influxMaxRetryTime = 0
+	//s.config.InfluxMaxRetryTime = "168h"
+	s.config.InfluxMaxRetries = 0
+	s.config.InfluxExponentialBase = 0
+	s.config.FlushInterval = 0
 
 	// Default retry intervals (in seconds)
 	// 1 2
@@ -174,12 +197,17 @@ func NewInfluxAsyncSink(name string, config json.RawMessage) (Sink, error) {
 	}
 
 	// Start background: Read from error channel
+	s.statsErrors = 0
 	s.errors = s.writeApi.Errors()
 	go func() {
 		for err := range s.errors {
+			s.statsErrors++
+			stats.ComponentStatInt(s.name, "errors", s.statsErrors)
 			cclog.ComponentError(s.name, err.Error())
 		}
 	}()
 
+	s.sentMetrics = 0
+	s.statsFlushes = 0
 	return s, nil
 }

sinks/influxSink.go

@@ -6,12 +6,15 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"sync"
 	"time"
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	influxdb2 "github.com/influxdata/influxdb-client-go/v2"
 	influxdb2Api "github.com/influxdata/influxdb-client-go/v2/api"
+	"github.com/influxdata/influxdb-client-go/v2/api/write"
 )
 
 type InfluxSinkConfig struct {
@@ -23,11 +26,13 @@ type InfluxSinkConfig struct {
 	Password     string `json:"password,omitempty"`
 	Organization string `json:"organization,omitempty"`
 	SSL          bool   `json:"ssl,omitempty"`
+	FlushDelay   string `json:"flush_delay,omitempty"`
+	BatchSize    int    `json:"batch_size,omitempty"`
 	RetentionPol string `json:"retention_policy,omitempty"`
-	InfluxRetryInterval   string `json:"retry_interval"`
-	InfluxExponentialBase uint   `json:"retry_exponential_base"`
-	InfluxMaxRetries      uint   `json:"max_retries"`
-	InfluxMaxRetryTime    string `json:"max_retry_time"`
+	// InfluxRetryInterval   string `json:"retry_interval"`
+	// InfluxExponentialBase uint   `json:"retry_exponential_base"`
+	// InfluxMaxRetries      uint   `json:"max_retries"`
+	// InfluxMaxRetryTime    string `json:"max_retry_time"`
 	//InfluxMaxRetryDelay  string `json:"max_retry_delay"` // It is mentioned in the docs but there is no way to set it
 }
 
@@ -38,6 +43,12 @@ type InfluxSink struct {
 	config                InfluxSinkConfig
 	influxRetryInterval   uint
 	influxMaxRetryTime    uint
+	batch                 []*write.Point
+	flushTimer            *time.Timer
+	flushDelay            time.Duration
+	lock                  sync.Mutex // Flush() runs in another goroutine, so this lock has to protect the buffer
+	statsSentMetrics      int64
+	statsProcessedMetrics int64
 	//influxMaxRetryDelay uint
 }
 
@@ -56,16 +67,31 @@ func (s *InfluxSink) connect() error {
 	}
 	cclog.ComponentDebug(s.name, "Using URI", uri, "Org", s.config.Organization, "Bucket", s.config.Database)
 	clientOptions := influxdb2.DefaultOptions()
+
+	// if s.influxRetryInterval != 0 {
+	// 	cclog.ComponentDebug(s.name, "MaxRetryInterval", s.influxRetryInterval)
+	// 	clientOptions.SetMaxRetryInterval(s.influxRetryInterval)
+	// }
+	// if s.influxMaxRetryTime != 0 {
+	// 	cclog.ComponentDebug(s.name, "MaxRetryTime", s.influxMaxRetryTime)
+	// 	clientOptions.SetMaxRetryTime(s.influxMaxRetryTime)
+	// }
+	// if s.config.InfluxExponentialBase != 0 {
+	// 	cclog.ComponentDebug(s.name, "Exponential Base", s.config.InfluxExponentialBase)
+	// 	clientOptions.SetExponentialBase(s.config.InfluxExponentialBase)
+	// }
+	// if s.config.InfluxMaxRetries != 0 {
+	// 	cclog.ComponentDebug(s.name, "Max Retries", s.config.InfluxMaxRetries)
+	// 	clientOptions.SetMaxRetries(s.config.InfluxMaxRetries)
+	// }
+
 	clientOptions.SetTLSConfig(
 		&tls.Config{
 			InsecureSkipVerify: true,
 		},
 	)
 
-	clientOptions.SetMaxRetryInterval(s.influxRetryInterval)
-	clientOptions.SetMaxRetryTime(s.influxMaxRetryTime)
-	clientOptions.SetExponentialBase(s.config.InfluxExponentialBase)
-	clientOptions.SetMaxRetries(s.config.InfluxMaxRetries)
+	clientOptions.SetPrecision(time.Second)
 
 	s.client = influxdb2.NewClientWithOptions(uri, auth, clientOptions)
 	s.writeApi = s.client.WriteAPIBlocking(s.config.Organization, s.config.Database)
@@ -80,38 +106,80 @@ func (s *InfluxSink) connect() error {
 }
 
 func (s *InfluxSink) Write(m lp.CCMetric) error {
-	err :=
-		s.writeApi.WritePoint(
-			context.Background(),
-			m.ToPoint(s.meta_as_tags),
-		)
-	return err
+	// err :=
+	// 	s.writeApi.WritePoint(
+	// 		context.Background(),
+	// 		m.ToPoint(s.meta_as_tags),
+	// 	)
+	if len(s.batch) == 0 && s.flushDelay != 0 {
+		// This is the first write since the last flush, start the flushTimer!
+		if s.flushTimer != nil && s.flushTimer.Stop() {
+			cclog.ComponentDebug(s.name, "unexpected: the flushTimer was already running?")
+		}
+
+		// Run a batched flush for all lines that have arrived in the last second
+		s.flushTimer = time.AfterFunc(s.flushDelay, func() {
+			if err := s.Flush(); err != nil {
+				cclog.ComponentError(s.name, "flush failed:", err.Error())
+			}
+		})
+	}
+	p := m.ToPoint(s.meta_as_tags)
+	s.lock.Lock()
+	s.statsProcessedMetrics++
+	s.batch = append(s.batch, p)
+	s.lock.Unlock()
+	stats.ComponentStatInt(s.name, "processed_metrics", s.statsProcessedMetrics)
+
+	// Flush synchronously if "flush_delay" is zero
+	if s.flushDelay == 0 {
+		return s.Flush()
+	}
+
+	return nil
 }
 
 func (s *InfluxSink) Flush() error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	if len(s.batch) == 0 {
+		return nil
+	}
+	err := s.writeApi.WritePoint(context.Background(), s.batch...)
+	if err != nil {
+		cclog.ComponentError(s.name, "flush failed:", err.Error())
+		return err
+	}
+	s.statsSentMetrics += int64(len(s.batch))
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
+	s.batch = s.batch[:0]
 	return nil
 }
 
 func (s *InfluxSink) Close() {
 	cclog.ComponentDebug(s.name, "Closing InfluxDB connection")
+	s.flushTimer.Stop()
+	s.Flush()
 	s.client.Close()
 }
 
 func NewInfluxSink(name string, config json.RawMessage) (Sink, error) {
 	s := new(InfluxSink)
 	s.name = fmt.Sprintf("InfluxSink(%s)", name)
+	s.config.BatchSize = 100
+	s.config.FlushDelay = "1s"
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &s.config)
 		if err != nil {
 			return nil, err
 		}
 	}
-	s.influxRetryInterval = uint(time.Duration(1) * time.Second)
-	s.config.InfluxRetryInterval = "1s"
-	s.influxMaxRetryTime = uint(7 * time.Duration(24) * time.Hour)
-	s.config.InfluxMaxRetryTime = "168h"
-	s.config.InfluxMaxRetries = 20
-	s.config.InfluxExponentialBase = 2
+	s.influxRetryInterval = 0
+	s.influxMaxRetryTime = 0
+	// s.config.InfluxRetryInterval = ""
+	// s.config.InfluxMaxRetryTime = ""
+	// s.config.InfluxMaxRetries = 0
+	// s.config.InfluxExponentialBase = 0
 
 	if len(s.config.Host) == 0 ||
 		len(s.config.Port) == 0 ||
@@ -126,19 +194,31 @@ func NewInfluxSink(name string, config json.RawMessage) (Sink, error) {
 		s.meta_as_tags[k] = true
 	}
 
-	toUint := func(duration string, def uint) uint {
-		t, err := time.ParseDuration(duration)
+	// toUint := func(duration string, def uint) uint {
+	// 	if len(duration) > 0 {
+	// 		t, err := time.ParseDuration(duration)
+	// 		if err == nil {
+	// 			return uint(t.Milliseconds())
+	// 		}
+	// 	}
+	// 	return def
+	// }
+	// s.influxRetryInterval = toUint(s.config.InfluxRetryInterval, s.influxRetryInterval)
+	// s.influxMaxRetryTime = toUint(s.config.InfluxMaxRetryTime, s.influxMaxRetryTime)
+
+	if len(s.config.FlushDelay) > 0 {
+		t, err := time.ParseDuration(s.config.FlushDelay)
 		if err == nil {
-			return uint(t.Milliseconds())
+			s.flushDelay = t
 		}
-		return def
 	}
-	s.influxRetryInterval = toUint(s.config.InfluxRetryInterval, s.influxRetryInterval)
-	s.influxMaxRetryTime = toUint(s.config.InfluxMaxRetryTime, s.influxMaxRetryTime)
+	s.batch = make([]*write.Point, 0, s.config.BatchSize)
 
 	// Connect to InfluxDB server
 	if err := s.connect(); err != nil {
 		return nil, fmt.Errorf("unable to connect: %v", err)
 	}
+	s.statsSentMetrics = 0
+	s.statsProcessedMetrics = 0
 	return s, nil
 }

sinks/influxSink.md

@@ -17,10 +17,8 @@ The `influxdb` sink uses the official [InfluxDB golang client](https://pkg.go.de
     "password" : "examplepw",
     "organization": "myorg",
     "ssl": true,
-    "retry_interval" : "1s",
-    "retry_exponential_base" : 2,
-    "max_retries": 20,
-    "max_retry_time" : "168h"
+    "flush_delay" : "1s",
+    "batch_size" : 100
   }
 }
 ```
@@ -34,9 +32,6 @@ The `influxdb` sink uses the official [InfluxDB golang client](https://pkg.go.de
 - `password`: Password for basic authentification
 - `organization`: Organization in the InfluxDB
 - `ssl`: Use SSL connection
-- `retry_interval`: Base retry interval for failed write requests, default 1s
-- `retry_exponential_base`: The retry interval is exponentially increased with this base, default 2
-- `max_retries`: Maximal number of retry attempts
-- `max_retry_time`: Maximal time to retry failed writes, default 168h (one week)
+- `flush_delay`: Group metrics coming in to a single batch
+- `batch_size`: Maximal batch size
 
-For information about the calculation of the retry interval settings, see [offical influxdb-client-go documentation](https://github.com/influxdata/influxdb-client-go#handling-of-failed-async-writes)

sinks/libgangliaSink.go

@@ -73,6 +73,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"github.com/NVIDIA/go-nvml/pkg/dl"
 )
 
@@ -107,6 +108,7 @@ type LibgangliaSink struct {
 	gmond_config     C.Ganglia_gmond_config
 	send_channels    C.Ganglia_udp_send_channels
 	cstrCache        map[string]*C.char
+	statsSentMetrics int64
 }
 
 func (s *LibgangliaSink) Write(point lp.CCMetric) error {
@@ -202,6 +204,8 @@ func (s *LibgangliaSink) Write(point lp.CCMetric) error {
 	C.Ganglia_metric_destroy(gmetric)
 	// Free the value C string, the only one not stored in the cache
 	C.free(unsafe.Pointer(c_value))
+	s.statsSentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
 	return err
 }
 
@@ -247,7 +251,7 @@ func NewLibgangliaSink(name string, config json.RawMessage) (Sink, error) {
 	if err != nil {
 		return nil, fmt.Errorf("error opening %s: %v", s.config.GangliaLib, err)
 	}
-
+	s.statsSentMetrics = 0
 	// Set up cache for the C strings
 	s.cstrCache = make(map[string]*C.char)
 	// s.cstrCache["globals"] = C.CString("globals")

sinks/prometheusSink.go

@@ -11,6 +11,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -34,6 +35,7 @@ type PrometheusSink struct {
 	nodeMetrics      map[string]prometheus.Gauge
 	promWg           sync.WaitGroup
 	promServer       *http.Server
+	statsSentMetrics int64
 }
 
 func intToFloat64(input interface{}) (float64, error) {
@@ -113,6 +115,8 @@ func (s *PrometheusSink) newMetric(metric lp.CCMetric) error {
 		s.nodeMetrics[name] = new
 		prometheus.Register(new)
 	}
+	s.statsSentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
 	return nil
 }
 
@@ -146,6 +150,8 @@ func (s *PrometheusSink) updateMetric(metric lp.CCMetric) error {
 		}
 		s.nodeMetrics[name].Set(value)
 	}
+	s.statsSentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
 	return nil
 }
 

sinks/sampleSink.go

@@ -7,6 +7,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 type SampleSinkConfig struct {
@@ -14,12 +15,15 @@ type SampleSinkConfig struct {
 	// See: metricSink.go
 	defaultSinkConfig
 	// Additional config options, for SampleSink
+
 }
 
 type SampleSink struct {
 	// declares elements 	'name' and 'meta_as_tags' (string to bool map!)
 	sink
 	config SampleSinkConfig // entry point to the SampleSinkConfig
+	// Stats counters
+	statsSentMetrics int64
 }
 
 // Implement functions required for Sink interface
@@ -30,6 +34,8 @@ type SampleSink struct {
 func (s *SampleSink) Write(point lp.CCMetric) error {
 	// based on s.meta_as_tags use meta infos as tags
 	log.Print(point)
+	s.statsSentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.statsSentMetrics)
 	return nil
 }
 
@@ -63,6 +69,9 @@ func NewSampleSink(name string, config json.RawMessage) (Sink, error) {
 		}
 	}
 
+	// Initalize stats counters
+	s.statsSentMetrics = 0
+
 	// Create lookup map to use meta infos as tags in the output metric
 	s.meta_as_tags = make(map[string]bool)
 	for _, k := range s.config.MetaAsTags {

sinks/sinkManager.go

@@ -102,13 +102,19 @@ func (sm *sinkManager) Start() {
 		}
 
 		toTheSinks := func(p lp.CCMetric) {
+			var wg sync.WaitGroup
 			// Send received metric to all outputs
 			cclog.ComponentDebug("SinkManager", "WRITE", p)
 			for _, s := range sm.sinks {
+				wg.Add(1)
+				go func(s Sink) {
 					if err := s.Write(p); err != nil {
 						cclog.ComponentError("SinkManager", "WRITE", s.Name(), "write failed:", err.Error())
 					}
+					wg.Done()
+				}(s)
 			}
+			wg.Wait()
 		}
 
 		for {

sinks/stdoutSink.go

@@ -8,6 +8,7 @@ import (
 
 	//	"time"
 	lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
+	stats "github.com/ClusterCockpit/cc-metric-collector/internal/metricRouter"
 )
 
 type StdoutSink struct {
@@ -17,6 +18,7 @@ type StdoutSink struct {
 		defaultSinkConfig
 		Output string `json:"output_file,omitempty"`
 	}
+	sentMetrics int64
 }
 
 func (s *StdoutSink) Write(m lp.CCMetric) error {
@@ -24,6 +26,8 @@ func (s *StdoutSink) Write(m lp.CCMetric) error {
 		s.output,
 		m.ToLineProtocol(s.meta_as_tags),
 	)
+	s.sentMetrics++
+	stats.ComponentStatInt(s.name, "sent_metrics", s.sentMetrics)
 	return nil
 }
 
@@ -68,6 +72,7 @@ func NewStdoutSink(name string, config json.RawMessage) (Sink, error) {
 	for _, k := range s.config.MetaAsTags {
 		s.meta_as_tags[k] = true
 	}
+	s.sentMetrics = 0
 
 	return s, nil
 }