[jira] [Commented] (KAFKA-7992) Add a server start time metric

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-7992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16776145#comment-16776145 ] 

ASF GitHub Bot commented on KAFKA-7992:
---------------------------------------

stanislavkozlovski commented on pull request #6318: KAFKA-7992: Introduce start-time-ms metric
URL: https://github.com/apache/kafka/pull/6318
 
 
   [KIP-436](https://cwiki.apache.org/confluence/display/KAFKA/KIP-436%3A+Add+a+metric+indicating+start+time)
   [KAFKA-7992](https://issues.apache.org/jira/browse/KAFKA-7992)
   
   This PR exposes a new `start-time-ms` metric aross all components
   
   Also removes the unused scala `AppInfo` class
 
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> Add a server start time metric
> ------------------------------
>
>                 Key: KAFKA-7992
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7992
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Stanislav Kozlovski
>            Assignee: Stanislav Kozlovski
>            Priority: Minor
>
> KIP: KIP-436
> As with all software systems, observability into their health is critical.
> With many deployment platforms (be them custom-built or open-source), tasks like restarting a misbehaving server in a cluster are completely automated. With Kafka, monitoring systems have no definitive source of truth to gauge when a server/client has been started. They are left to either use arbitrary Kafka-specific metrics as a heuristic or the JVM RuntimeMXBean's StartTime, which is not exactly indicative of when the application itself started
> It would be useful to have a metric exposing when the kafka server has started.



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