[jira] [Updated] (CASSANDRA-20499) add metrics about apply, fileSize and throttle to hinted handoff

["Maxim Muzafarov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-20499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maxim Muzafarov updated CASSANDRA-20499:
----------------------------------------
    Reviewers: Maxim Muzafarov, Stefan Miklosovic  (was: Stefan Miklosovic)

> add metrics about apply, fileSize and throttle to hinted handoff
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-20499
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20499
>             Project: Apache Cassandra
>          Issue Type: Improvement
>          Components: Observability/Metrics
>            Reporter: Ling Mao
>            Assignee: Ling Mao
>            Priority: Normal
>             Fix For: 5.x
>
>         Attachments: metric-hinted-handoff.jpg
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Although Cassandra already exposes metrics related to hinted handoff, this PR enhances observability by introducing additional metrics to provide deeper insights into its behavior.
> This PR introduces the following new metrics:
> {code:java}
> 1. The total size (in bytes) of hint files stored on the current node.
> max(cassandra_hintsservice_hintsfilesize) by (instance)
> 2. A counter tracking the number of hints being replayed by the current node.
> max(cassandra_hintsservice_hintsapplysucceeded_count) by (instance)
> max(cassandra_hintsservice_hintsapplyfailed_count) by (instance)
> 3. The current node's hint handoff throttle consumption and how close it is to reaching the throttle limit(hinted_handoff_throttle_in_kb).
> rate(cassandra_hintsservice_hintsthrottle_count{instance=~"$instance"}[1m]) / 1024
> {code}
> A Grafana preview is included in the JIRA ticket.



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