[ZOOKEEPER-4284] Add metrics for observer sync time

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.7.0, 3.7.1
• Fix Version/s: 3.8.0, 3.7.1
• Component/s: metric system
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Li Wang
• Created: 20/Apr/21 18:30
• Updated: 30/Jun/21 07:12
• Resolved: 30/Jun/21 06:55

Description

With enabling the feature of followers hosting observers, it would be nice if we have a metric to measure the observer sync time just like what we have for the follower sync time.

Issue Links

• links to: GitHub Pull Request #1691