windows_exporter

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Table of Contents

Prometheus and WMI CounterTypes
Finding available counters

Prometheus and WMI CounterTypes

WMI performance counters have many types, and those need to be mapped to Prometheus' types. Below is a listing of WMI types, the Prometheus type that should be used, and any processing that needs to be done.

This applies to WMI classes inheriting Win32_PerfRawData.

WMI type	Prometheus type	Notes
`PERF_COUNTER_RAWCOUNT_HEX`	`gauge`
`PERF_COUNTER_LARGE_RAWCOUNT_HEX`	`gauge`
`PERF_COUNTER_TEXT`	??	A string
`PERF_COUNTER_RAWCOUNT`	`gauge`
`PERF_COUNTER_LARGE_RAWCOUNT`	`gauge`
`PERF_DOUBLE_RAW`	??	No docs
`PERF_COUNTER_DELTA`	`gauge`
`PERF_COUNTER_LARGE_DELTA`	`gauge`
`PERF_SAMPLE_COUNTER`	`counter`
`PERF_COUNTER_QUEUELEN_TYPE`	`gauge`
`PERF_COUNTER_LARGE_QUEUELEN_TYPE`	`gauge`
`PERF_COUNTER_100NS_QUEUELEN_TYPE`	`gauge`
`PERF_COUNTER_OBJ_TIME_QUEUELEN_TYPE`	`gauge`
`PERF_COUNTER_COUNTER`	`counter`
`PERF_COUNTER_BULK_COUNT`	`counter`
`PERF_RAW_FRACTION`	`gauge`	Verify units. Numerator. Goes with `PERF_RAW_BASE`
`PERF_COUNTER_TIMER`	`counter`	PerfTime, normalise to seconds.
`PERF_PRECISION_SYSTEM_TIMER`	`counter`	PerfTime, normalise to seconds.
`PERF_100NSEC_TIMER`	`counter`	Normalize to seconds (`value / 1e7`)
`PERF_PRECISION_100NS_TIMER`	`counter`	Normalize to seconds (`value / 1e7`)
`PERF_OBJ_TIME_TIMER`	`counter`	Object-specific units
`PERF_PRECISION_OBJECT_TIMER`	`counter`	Object-specific units
`PERF_SAMPLE_FRACTION`	`gauge`	Verify units. Numerator. Goes with `PERF_SAMPLE_BASE`
`PERF_COUNTER_TIMER_INV`	`counter`	Inactive time. PerfTime, normalise to seconds
`PERF_100NSEC_TIMER_INV`	`counter`	Inactive time. Normalize to seconds (`value / 1e7`)
`PERF_COUNTER_MULTI_TIMER`	Many `counter`	PerfTime, normalise to seconds
`PERF_100NSEC_MULTI_TIMER`	Many `counter`	Normalize to seconds (`value / 1e7`)
`PERF_COUNTER_MULTI_TIMER_INV`	Many `counter`	Inactive time. PerfTime, normalise to seconds
`PERF_100NSEC_MULTI_TIMER_INV`	Many `counter`	Inactive time. Normalize to seconds (`value / 1e7`)
`PERF_AVERAGE_TIMER`	`summary`	Verify units. The `_count` is the `_Base`
`PERF_ELAPSED_TIME`	`gauge`	PerfTime, normalise to seconds. Convert to unixtime?
`PERF_COUNTER_NODATA`	??	Error value?
`PERF_AVERAGE_BULK`	`summary`	`_sum` part. Goes with `PERF_AVERAGE_BASE`
`PERF_SAMPLE_BASE`	`gauge`	Verify units. Denominator. Goes with `PERF_SAMPLE_FRACTION`
`PERF_AVERAGE_BASE`	`summary`	`_count` part. Goes with `PERF_AVERAGE_BULK`
`PERF_RAW_BASE`	`gauge`	Verify units. Denominator. Goes with `PERF_RAW_FRACTION`
`PERF_PRECISION_TIMESTAMP`	`counter`	PerfTime, normalise to seconds
`PERF_LARGE_RAW_FRACTION`	`counter`	Verify units. Numerator. Goes with `PERF_LARGE_RAW_FRACTION`
`PERF_LARGE_RAW_BASE`	`counter`	Verify units. Denominator. Goes with `PERF_LARGE_RAW_FRACTION`
`PERF_COUNTER_MULTI_BASE`	`counter`	Seems to be a time denominator. Drop.
`PERF_COUNTER_HISTOGRAM_TYPE`	??	No docs.

To convert "PerfTime" units to seconds, divide by the result of QueryPerformanceFrequency().

Finding available counters

This Powershell line will output available WMI classes that are of type Win32_PerfRawData:

Get-WmiObject -query "SELECT * FROM meta_class WHERE __this ISA 'Win32_PerfRawData'" | 
    Select-Object -ExpandProperty Name