Zammad - Grafana no longer generating data

Hi All
I’ve been using the Grafana/Zammad reporting too for a while now.
I’ve having trouble getting data, it seem that about 3 months ago it just stopped saving/generating data.
If i look at the data the latest entry is 07/22/2021 and it’s not updating.

I’ve restarted the elastic search service and I’ve rebooted the Zammad server with no change.
Any ideas, what I should be looking for?

Sounds like your Elasticsearch installation is no longer receiving data by Zammad.
Possibly also your indexes changed?

Zammads production log may contain indicators.
You can double tab if your Elasticsearch is installed correctly by using this:
https://docs.zammad.org/en/latest/install/elasticsearch.html

Helping further without any details to your installation doesn’t help I’m afraid.

Thanks for taking a look.
I believe that is the installation that was used in setting this up it was before my time.
But it looks like it’s the same looking at the server history.
Here is some of the logs.

[2020-12-09T01:30:00,000][INFO ][o.e.x.m.MlDailyMaintenanceService] [zammad] triggering scheduled [ML] maintenance tasks
[2020-12-09T01:30:00,008][INFO ][o.e.x.m.a.TransportDeleteExpiredDataAction] [zammad] Deleting expired data
[2020-12-09T01:30:00,011][INFO ][o.e.x.m.a.TransportDeleteExpiredDataAction] [zammad] Completed deletion of expired ML data
[2020-12-09T01:30:00,011][INFO ][o.e.x.m.MlDailyMaintenanceService] [zammad] Successfully completed [ML] maintenance tasks
[2020-12-09T11:21:44,047][INFO ][o.e.n.Node               ] [zammad] stopping ...
[2020-12-09T11:21:44,128][INFO ][o.e.x.w.WatcherService   ] [zammad] stopping watch service, reason [shutdown initiated]
[2020-12-09T11:21:44,132][INFO ][o.e.x.w.WatcherLifeCycleService] [zammad] watcher has stopped and shutdown
[2020-12-09T11:21:44,451][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [zammad] [controller/9492] [Main.cc@150] Ml controller exiting
[2020-12-09T11:21:44,452][INFO ][o.e.x.m.p.NativeController] [zammad] Native controller process has stopped - no new native processes can be started
[2020-12-09T11:21:44,720][INFO ][o.e.n.Node               ] [zammad] stopped
[2020-12-09T11:21:44,721][INFO ][o.e.n.Node               ] [zammad] closing ...
[2020-12-09T11:21:44,747][INFO ][o.e.n.Node               ] [zammad] closed

Above is the elasticsearch log file.
You want to have a look into /var/log/zammad/.