Yingchun Lai has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/21507 )

Change subject: [metrics] Add metrics for tablet replication time
......................................................................

[metrics] Add metrics for tablet replication time

Add tablet-level metric to track the time cost of
replication between replicas.

To verify the correctness of the new logic, I
constructed a synchronization scenario based on
write operations.

The addition of monitoring items will aid in
historical issue tracking and analysis, as well
as facilitate the configuration of monitoring alarms.

Change-Id: I4ea89c3954ceecabdb2998d2a8945f12a2fb8aa9
Reviewed-on: http://gerrit.cloudera.org:8080/21507
Reviewed-by: Zoltan Chovan <[email protected]>
Reviewed-by: Yingchun Lai <[email protected]>
Tested-by: Yingchun Lai <[email protected]>
---
M src/kudu/tablet/ops/op_driver.cc
M src/kudu/tablet/tablet_metrics.cc
M src/kudu/tablet/tablet_metrics.h
M src/kudu/tablet/tablet_replica-test.cc
4 files changed, 31 insertions(+), 1 deletion(-)

Approvals:
  Zoltan Chovan: Looks good to me, but someone else must approve
  Yingchun Lai: Looks good to me, approved; Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I4ea89c3954ceecabdb2998d2a8945f12a2fb8aa9
Gerrit-Change-Number: 21507
Gerrit-PatchSet: 3
Gerrit-Owner: KeDeng <[email protected]>
Gerrit-Reviewer: KeDeng <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Yingchun Lai <[email protected]>
Gerrit-Reviewer: Zoltan Chovan <[email protected]>

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