area/docdbgood first issuekind/enhancementpriority/medium
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描述
Jira Link: DB-6564
Description
We should add some metrics around how many times we call it and how much memory we release at a time. This is primarily useful for the tserver, but could also be valuable for PG, as we now use a MemTracker in PG and we've observed, in some benchmarks, that the PG time spent on the MemTracker can add up to 5% total time to the scan queries. cc @spolitov @timothy-e
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