davidradl commented on code in PR #25884:
URL: https://github.com/apache/flink/pull/25884#discussion_r1909057084
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docs/content/docs/ops/metrics.md:
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@@ -1526,6 +1526,41 @@ Note that for failed checkpoints, metrics are updated on
a best efforts basis an
### RocksDB
Certain RocksDB native metrics are available but disabled by default, you can
find full documentation [here]({{< ref "docs/deployment/config"
>}}#rocksdb-native-metrics)
+### ForStDB
+<table class="table table-bordered">
+ <thead>
+ <tr>
+ <th class="text-left" style="width: 18%">Scope</th>
+ <th class="text-left" style="width: 26%">Metrics</th>
+ <th class="text-left" style="width: 48%">Description</th>
+ <th class="text-left" style="width: 8%">Type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <th rowspan="4"><strong>Task/Operator</strong></th>
+ <td>forst.fileCache.hit</td>
+ <td>The hit count of ForSt state backend cache.</td>
Review Comment:
I am curious.
Do the cache entries get invalidated at any time , due to size or time? Is
this something we can capture in the metrics? I assume a miss will result in
the value being added to the cache.
It would be useful to include in the documentation how to interpret the hit
and miss counts and when they indicate that something needs to be changed /
tuned.
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