[kudu-CR] WIP [consensus] more metrics for LogCache

["Alexey Serbin (Code Review)" <ge...@cloudera.org>]

Alexey Serbin has uploaded this change for review. ( http://gerrit.cloudera.org:8080/18104


Change subject: WIP [consensus] more metrics for LogCache
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WIP [consensus] more metrics for LogCache

This patch adds more debug-level metrics to the LogCache for better
observability (also, I did this in attempt to better understand the
LogCache's main use case).

WIP:
  * add test coverage for the newly added metrics
  * find a test scenario to see at least 1 hit in the cache -- so far
    when playing with `kudu perf loadgen`, no hits were observed

Change-Id: Ia3c7569621f8e73a2a4bf9f171de092f50ff2b38
---
M src/kudu/consensus/log_cache.cc
M src/kudu/consensus/log_cache.h
2 files changed, 69 insertions(+), 6 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/04/18104/1
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Ia3c7569621f8e73a2a4bf9f171de092f50ff2b38
Gerrit-Change-Number: 18104
Gerrit-PatchSet: 1
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>