feat(monitoring): add default grafana dashboards as configmap

[hiteshnayak305]

Description of the change

Add a default grafana dashboard as configmap which can be provisioned in grafana stack (grafana + prometheus + loki + promtail).

Ref: https://github.com/grafana/helm-charts/tree/main/charts/grafana#sidecar-for-dashboards

Applicable issues

• fixes Add grafana dashboard provisioned with Helm #133

Dashboard Preview

[bo0tzz]

Cool! I think if we're gonna have a dashboard for Immich, it should probably live somewhere more centrally and then get pulled into the chart.

[hiteshnayak305]

Cool! I think if we're gonna have a dashboard for Immich, it should probably live somewhere more centrally and then get pulled into the chart.

I checked with generics charts like prometheus, grafana most of them have packaged in helm repository and managed. Or we can try Grafana Lab.

[bo0tzz]

The intent behind my suggestion is that the dashboard can be useful for more than just the helm chart, so it might make more sense to keep it in the main immich repository (though I'm not quite sure where yet). We can then have the helm chart include it from there though.

[hiteshnayak305]

yes i also agree with central location for dashboards management. but in this dashboard i have used namespace as label paramater so we will need to create another generic dashboard if want to use outside kubernetes cluster.
or namespace label need to be set manually for standalone deployments.