Helm-charts: [kube-prometheus-stack] Can't find upgrade procedure from stable/prometheus-operator

[TrustNoOne]

Hi, I've been looking everywhere but I can't find how to upgrade stable/prometheus-operator to the renamed chart. I looked in open issues but found nothing.

I've never upgraded a renamed chart, I tried to look it up with no luck. Can anyone point me to that if it's anywhere?

I guess it's worth mentioning it in https://github.com/prometheus-community/helm-charts/blob/main/charts/kube-prometheus-stack/README.md ?

[den-is]

The easiest way is that you will have to do a clean reinstall from scratch :(

Virtually I can imagine that there is a way to migrate Prometheus data manually if it is stored in PVs to new PVs with new names - you can fake and create statefulset volumes by yourself - just match the name of these volumes with what the chart would do by itself.

[tbomberg]

It looks like upgrading the chart is possible by setting

nameOverride: prometheus-operator

in your values.yaml (or add it to the --set's in your helm upgrade commandline)
This way the generated object names stay the same as with the old chart.

[monotek]

@tbomberg
Would you mind to add this info to readme via a pr?

[scottrigby]

Thanks yes was thinking the same as @monotek here – a PR would be helpful 👍 Testing PVCs is one of the things we asked people to help with in #1, but I don't believe anyone did, and in the end I didn't have enough personal experience with persistence in this chart and it's subcharts to know what to test.

There is already this Migrating from coreos/prometheus-operator chart > Persistent Volumes section in the README. Do these steps help meet your need?

Either way, I would like to see a similar Upgrading from stable/prometheus-operator section as well. Including:

• in-place release upgrade
• recreate release with new chart, and (optionally) attach existing volume claims

The community could then continue adding to that section as new use cases upgrading from stable/prometheus-operator are defined.

[fktkrt]

I was not able to properly migrate using the solution described above.

Re-using existing PVs might be the most crucial step during this process mostly.
I've created a PR tackling this issue, and with those steps I was able to migrate my existing storage successfully to the new chart.