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docs: explain idle time rates above 1 for logical_disk and physical_disk (#2770)

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Co-authored-by: Claude <noreply@anthropic.com>
Signed-off-by: Claude <noreply@anthropic.com>
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Jan-Otto Kröpke
2026-10-16 21:33:09 +02:00
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co-authored by Claude
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internal/collector/physical_disk/AGENTS.md
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@@ -19,6 +19,13 @@ multi-instance. These notes were recorded on a Windows Server 2025
(`% Disk Read Time`, `% Disk Write Time`, `% Idle Time`) to seconds.
`PERF_AVERAGE_TIMER` values arrive in ticks of the 10 MHz counter time base
and need the 1e-7 factor.
- The second raw value of `% Idle Time` is the sample time as a UTC FILETIME;
PDH divides by its delta. Even with that divisor the idle delta of a busy
disk exceeded the elapsed time by up to 43% between 1 s samples on a
Windows 11 NVMe disk (the cooked value of one sample reached 150%) after a 1.6 GB write ended, while idle
disks stayed at 1.000 and `Processor Information` idle time never exceeded 1.
The accumulator lags while busy and catches up later (#1249). The collector
exports the raw counter; queries clamp the rate with `clamp_max(..., 1)`.
- The `PERF_AVERAGE_TIMER` base is the operation count: it equals
`Disk Reads/sec` (781613), `Disk Writes/sec` (940802) and their sum
(1722415).