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objectcache: add statsd key metrics to BagOStuff classes

Description

objectcache: add statsd key metrics to BagOStuff classes

Update SQL, REST, and redis subclasses to emit call count and
payload size metrics for cache key operations. These metrics
are bucketed by cache key collection (similar to WANCache).

Bug: T235705
Change-Id: Icaa3fa1ae9c8b0f664c26ce70b7e1c4fc5f92767

Details

Provenance
aaronAuthored on Dec 28 2020, 10:34 PM
Parents
rMW9834fd052cc7: Merge "rdbms: cleanup comments and constants "conns" field of LoadBalancer"
Branches
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Tags
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ChangeId
Icaa3fa1ae9c8b0f664c26ce70b7e1c4fc5f92767