[jira] [Assigned] (KUDU-3048) Add time/clock synchronization metrics

["Alexey Serbin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Serbin reassigned KUDU-3048:
-----------------------------------

    Assignee: Alexey Serbin

> Add time/clock synchronization metrics
> --------------------------------------
>
>                 Key: KUDU-3048
>                 URL: https://issues.apache.org/jira/browse/KUDU-3048
>             Project: Kudu
>          Issue Type: Improvement
>          Components: clock, master, tserver
>            Reporter: Alexey Serbin
>            Assignee: Alexey Serbin
>            Priority: Major
>              Labels: clock
>
> For better visibility, it would be great to add metrics reflecting time/clock synchronization parameters:
> * maximum clock error
> * extrapolating the time:
> ** the number of times when {{clock::TimeService::WalltimeWithError()}} returned an error, so it was necessary to extrapolate the clock readings
> ** the timestamp of the last occurrence of the event above
> * if using the {{built-in}} time source:
> ** the number of servers used for the true time tracking (good references)
> ** the number of servers not used for the true time tracking (bad references)



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