Add option for users to add starting parameters

[BrutalBirdie]

I just noticed my Prometheus has no data from 2 months ago, did some research:

When to remove old data. Defaults to 15d. Overrides
https://prometheus.io/docs/prometheus/latest/storage/

This is bad for obvious reasons, I myself use Prometheus to analyze usage of BigBlueButton Servers / Clusters.
And now suddenly data is missing. Why I have not noticed this earlier I don't know.

This is configured via. starting parameters --storage.tsdb.retention.time and not via the config file.

Giving the user the option to change this would be awesome.

(ps: I will get my hands on this issue tomorrow.)

[nebulon]

@brutalbirdie this would indeed be good to allow. Strange that this is not part of the config file though.

[BrutalBirdie]

There is an open Issue and PR for this topic on the upstream project to make this configurable via config file as well.

https://github.com/prometheus/prometheus/issues/9115

[BrutalBirdie]

I added a PR for the Cloudron app since the github PR is kinda stale, and I am still losing data.

https://git.cloudron.io/cloudron/prometheus-server-app/-/merge_requests/3

[nebulon]

@brutalbirdie thanks, I merged it and made a new package release.