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docs: improve file collector docs with pattern cardinality guidance and query examples (#2381)

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Co-authored-by: dominik_esb <d.eisenberg@outlook.de>
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Dominik Eisenberg
2026-04-06 21:11:57 +02:00
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commit ccd4289e77
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@@ -22,6 +22,8 @@ See https://github.com/bmatcuk/doublestar#patterns for an extended description o
| `windows_file_mtime_timestamp_seconds` | File modification time | gauge | `file`, `pattern` | | `windows_file_mtime_timestamp_seconds` | File modification time | gauge | `file`, `pattern` |
| `windows_file_size_bytes` | File size | gauge | `file`, `pattern` | | `windows_file_size_bytes` | File size | gauge | `file`, `pattern` |
> Warning: if a very large number of files are matched, the combination of `file` and `pattern` labels can increase cardinality significantly. Use narrow patterns where possible.
### Example metric ### Example metric
``` ```
@@ -34,7 +36,12 @@ windows_file_size_bytes{file="C:\\Users\\admin\\Desktop\\Dashboard.lnk",pattern=
``` ```
## Useful queries ## Useful queries
_This collector does not yet have any useful queries added, we would appreciate your help adding them!_ When the same file matches multiple patterns, the `pattern` label makes each sample unique. This also allows aggregation by pattern instead of introducing a separate count metric.
```promql
sum(windows_file_size_bytes) by (pattern)
count(windows_file_size_bytes) by (pattern)
```
## Alerting examples ## Alerting examples
_This collector does not yet have alerting examples, we would appreciate your help adding them!_ _This collector does not yet have alerting examples, we would appreciate your help adding them!_