cc-metric-collector/collectors/iostatMetric.md

iostat collector

  "iostat": {
    "exclude_metrics": [
      "io_read_ms"
    ],
    "exclude_devices": [
      "nvme0n1p1",
      "nvme0n1p2",
      "md127"
    ],
    "only_metrics": [],
    "send_abs_values": true,
    "send_diff_values": true,
    "send_derived_values": true
  }

The iostat collector reads data from /proc/diskstats and outputs a handful node metrics. If a metric is not required, it can be excluded from forwarding it to the sink.

Both filtering mechanisms are supported:

• exclude_metrics: Excludes the specified metrics.
• only_metrics: If provided, only the listed metrics are collected. This takes precedence over exclude_metrics.

Absolute Metrics:

• io_reads
• io_reads_merged
• io_read_sectors
• io_read_ms
• io_writes
• io_writes_merged
• io_writes_sectors
• io_writes_ms
• io_ioops
• io_ioops_ms
• io_ioops_weighted_ms
• io_discards
• io_discards_merged
• io_discards_sectors
• io_discards_ms
• io_flushes
• io_flushes_ms

Diff Metrics: For each metric, if send_diff_values is enabled, the collector computes the difference (current value minus previous value) and sends it with the suffix _diff.

Derived Metrics: For each metric, if send_derived_values is enabled, the collector computes the derived rate (difference divided by the time interval) and sends it with the suffix _rate.

The device name is added as tag device. For more details, see https://www.kernel.org/doc/html/latest/admin-guide/iostats.html