Modularize the whole thing (#16)

* Use channels, add a metric router, split up configuration and use extended version of Influx line protocol internally

* Use central timer for collectors and router. Add expressions to router

* Add expression to router config

* Update entry points

* Start with README

* Update README for CCMetric

* Formatting

* Update README.md

* Add README for MultiChanTicker

* Add README for MultiChanTicker

* Update README.md

* Add README to metric router

* Update main README

* Remove SinkEntity type

* Update README for sinks

* Update go files

* Update README for receivers

* Update collectors README

* Update collectors README

* Use seperate page per collector

* Fix for tempstat page

* Add docs for customcmd collector

* Add docs for ipmistat collector

* Add docs for topprocs collector

* Update customCmdMetric.md

* Use seconds when calculating LIKWID metrics

* Add IB metrics ib_recv_pkts and ib_xmit_pkts

* Drop domain part of host name

* Updated to latest stable version of likwid

* Define source code dependencies in Makefile

* Add GPFS / IBM Spectrum Scale collector

* Add vet and staticcheck make targets

* Add vet and staticcheck make targets

* Avoid go vet warning:
struct field tag `json:"..., omitempty"` not compatible with reflect.StructTag.Get: suspicious space in struct tag value
struct field tag `json:"...", omitempty` not compatible with reflect.StructTag.Get: key:"value" pairs not separated by spaces

* Add sample collector to README.md

* Add CPU frequency collector

* Avoid staticcheck warning: redundant return statement

* Avoid staticcheck warning: unnecessary assignment to the blank identifier

* Simplified code

* Add CPUFreqCollectorCpuinfo
a metric collector to measure the current frequency of the CPUs
as obtained from /proc/cpuinfo
Only measure on the first hyperthread

* Add collector for NFS clients

* Move publication of metrics into Flush() for NatsSink

* Update GitHub actions

* Refactoring

* Avoid vet warning: Println arg list ends with redundant newline

* Avoid vet warning struct field commands has json tag but is not exported

* Avoid vet warning: return copies lock value.

* Corrected typo

* Refactoring

* Add go sources in internal/...

* Bad separator in Makefile

* Fix Infiniband collector

Co-authored-by: Holger Obermaier <40787752+ho-ob@users.noreply.github.com>

collectors/nvidiaMetric.md

@@ -0,0 +1,40 @@
+
+## `nvidia` collector
+
+```json
+  "lustrestat": {
+    "exclude_devices" : [
+      "0","1"
+    ],
+    "exclude_metrics": [
+      "fb_memory",
+      "fan"
+    ]
+  }
+```
+
+Metrics:
+* `util`
+* `mem_util`
+* `mem_total`
+* `fb_memory`
+* `temp`
+* `fan`
+* `ecc_mode`
+* `perf_state`
+* `power_usage_report`
+* `graphics_clock_report`
+* `sm_clock_report`
+* `mem_clock_report`
+* `max_graphics_clock`
+* `max_sm_clock`
+* `max_mem_clock`
+* `ecc_db_error`
+* `ecc_sb_error`
+* `power_man_limit`
+* `encoder_util`
+* `decoder_util`
+
+It uses a separate `type` in the metrics. The output metric looks like this:
+`<name>,type=accelerator,type-id=<nvidia-gpu-id> value=<metric value> <timestamp>`
+