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Get metrics of wb_changes table
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Description

We need to get metrics on median of timestamp of change rows of in wb_changes table and also the oldest timestamp in the table live.

This is mostly blocked on T240685: MediaWiki Prometheus support

Event Timeline

Change 723613 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):

[analytics/wmde/scripts@master] [WIP] Add script to get some data out of wb_changes

https://gerrit.wikimedia.org/r/723613

Change 723613 merged by jenkins-bot:

[analytics/wmde/scripts@master] Add script to get some data out of wb_changes

https://gerrit.wikimedia.org/r/723613

Change 725416 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):

[analytics/wmde/scripts@production] Add script to get some data out of wb_changes

https://gerrit.wikimedia.org/r/725416

Change 725416 merged by jenkins-bot:

[analytics/wmde/scripts@production] Add script to get some data out of wb_changes

https://gerrit.wikimedia.org/r/725416

Change 725693 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):

[analytics/wmde/scripts@master] Fix metrics building in wb_changes

https://gerrit.wikimedia.org/r/725693

Change 725693 merged by jenkins-bot:

[analytics/wmde/scripts@master] Fix metrics building in wb_changes

https://gerrit.wikimedia.org/r/725693

Change 725425 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):

[analytics/wmde/scripts@production] Fix metrics building in wb_changes

https://gerrit.wikimedia.org/r/725425

Change 725425 merged by jenkins-bot:

[analytics/wmde/scripts@production] Fix metrics building in wb_changes

https://gerrit.wikimedia.org/r/725425

This has been implemented with an analytics script reading from a replica. Further work on this after T240685 is done, might happen in context of T291616

Michael claimed this task.