[RATIS-652] Add metrics related to snapshot and log purge

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: server
• Assignee: Aravindan Vijayan
• Reporter: Shashikant Banerjee
• Created: 01/Aug/19 19:33
• Updated: 18/Nov/19 11:17
• Resolved: 18/Nov/19 11:16

Description

Following metrics would be good to determine overall snapshot and log purge behaviour of a ratis pipeline:

 

takeSnapshotLatency	Time taken to take a ratis snapshot.
numSnapshots	Number of snapshots taken
purgeLogRecordLatency	Time taken to purge logRecords.
numPurgeLogCalls	Number of Purge log calls
numInstallSnapshotOps	Number of install snapshot calls