[users at bb.net] No builders displayed unless "Show old builders" checked (though they are still active)

[Vlad Bogolin]

Hi,

I have noticed that after we switched to a multi-master configuration (one
for user interface and one for builds) from time to time the list of active
builders and workers is empty. However, if "Show old builders" is checked,
all the builders (with running jobs) appear.

You can see this behaviour here: https://buildbot.mariadb.org/#/builders.

The issue disappears after restarting the master which handles the builds
(no need to restart the interface master), but then at some point, the
behaviour repeats itself. On the "Master" page, both masters appear as
active.

The build process doesn't seem to be affected by this issue.

Does anyone know why this is happening and how can it be solved?

Thanks,
Vlad
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