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docs: note WSL filesystem caveat for MultiProcessCollector #1183

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csmarchbanks merged 1 commit into from
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docs: note WSL filesystem caveat for MultiProcessCollector #1183

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6 changes: 6 additions & 0 deletions docs/content/multiprocess/_index.md
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Expand Up @@ -35,6 +35,12 @@ between process/Gunicorn runs (before startup is recommended).
This environment variable should be set from a start-up shell script,
and not directly from Python (otherwise it may not propagate to child processes).

Note: on Windows Subsystem for Linux (WSL), set `PROMETHEUS_MULTIPROC_DIR` to a
Linux-native filesystem path (e.g. `/tmp` or `/home/<user>`) rather than a
Windows-mounted path (e.g. `/mnt/c/...`). On Windows-mounted filesystems the
per-process metric files can be written with an incorrect internal offset,
causing the collector to silently read no data.

**2. Metrics collector**:

The application must initialize a new `CollectorRegistry`, and store the
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