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METRICS.md

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snap collector plugin - iostat

Collected Metrics

This plugin has the ability to gather the following metrics:

  • CPU statistics, represented by the metrics with prefix /intel/iostat/avg-cpu/
  • Device statistics, represented by the metrics with prefix /intel/iostat/device/
Namespace Data Type Description
/intel/iostat/avg-cpu/%user float64 The percentage of CPU utilization that occurred while executing at the user level (the application usage)
/intel/iostat/avg-cpu/%nice float64 The percentage of CPU utilization that occurred while executing at the user level with nice priority
/intel/iostat/avg-cpu/%system float64 The percentage of CPU utilization that occurred while executing at the system level (the kernel usage)
/intel/iostat/avg-cpu/%iowait float64 The percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request
/intel/iostat/avg-cpu/%steal float64 The percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was servicing another virtual processor
/intel/iostat/avg-cpu/%idle float64 The percentage of time that the CPU or CPUs were idle and the systems did not have an outstanding disk I/O request
/intel/iostat/device/[device_id]/rrqm_per_sec float64 The number of read requests merged per second queued to the device
/intel/iostat/device/[device_id]/wrqm_per_sec float64 The number of write requests merged per second queued to the device
/intel/iostat/device/[device_id]/r_per_sec float64 The number of read requests issued to the device per second
/intel/iostat/device/[device_id]/w_per_sec float64 The number of write requests issued to the device per second
/intel/iostat/device/[device_id]/rkB_per_sec float64 The number of kilobytes read from the device per second
/intel/iostat/device/[device_id]/wkB_per_sec float64 The number of kilobytes written to the device per second
/intel/iostat/device/[device_id]/avgrq-sz float64 The average size (in sectors) of the requests issued to the device
/intel/iostat/device/[device_id]/avgqu-sz float64 The average queue length of the requests issued to the device
/intel/iostat/device/[device_id]/await float64 The average time (milliseconds) for I/O requests issued to the device to be served This includes the time spent by the requests in queue and the time spent servicing them
/intel/iostat/device/[device_id]/r_await float64 The average time (in milliseconds) for read requests issued to the device to be served which includes the time spent by the requests in queue and the time spent servicing them
/intel/iostat/device/[device_id]/w_await float64 The average time (in milliseconds) for write requests issued to the device to be served which includes the time spent by the requests in queue and the time spent servicing them
/intel/iostat/device/[device_id]/svctm float64 The average service time (in milliseconds) for I/O requests issued to the device - Warning! Do not trust this field; it will be removed in a future version of sysstat
/intel/iostat/device/[device_id]/%util float64 Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device); device saturation occurs when this values is close to 100%

Notes:

  • The total number of read and write requests issued to the device per second equals the number of transaction per second
    • tps=r_per_sec+w_per_sec
  • The metrics are sampled over 1 second
  • If would like the results since boot you can set the config option ReportSinceBoot to true, see how it is done in an examplary task manifest