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https://issues.apache.org/jira/browse/HBASE-25539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17289130#comment-17289130
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Hudson commented on HBASE-25539:
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Results for branch branch-1
        [build #88 on 
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-1/88/]:
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> Add metric for age of oldest wal.
> ---------------------------------
>
>                 Key: HBASE-25539
>                 URL: https://issues.apache.org/jira/browse/HBASE-25539
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>    Affects Versions: 3.0.0-alpha-1, 1.6.0, 2.5.0, 2.4.2
>            Reporter: Rushabh Shah
>            Assignee: Rushabh Shah
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 1.7.0, 2.5.0, 2.4.2
>
>
> In our production clusters, we have seen multiple cases where some of the 
> wals are lingering in zk replication queues for months and we have no insight 
> into it. Recently we fixed one case where wal was getting stuck if it is 0 
> size and from old sources. HBASE-25536. It would be helpful if we can have 
> some metric which will tell us the age of oldest wal and we can add an alert 
> for monitoring purpose.



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