Passthrough Refactor Tempo

General MR

Summary

Refactor Tempo to passthrough pattern refactor

Umbrella Branch

99-refactor

Relevant logs/screenshots

N/A

Linked Issue

Links to #99 (closed) and #120 (closed)

Upgrade Notices

All package specific values will now need to be shifted under the upstream key.

Example:

Previous Values

tempo:
  # -- Docker image repository
  repository: registry1.dso.mil/ironbank/opensource/grafana/tempo
  # -- Docker image tag
  tag: 2.7.2
  # -- Docker image pull policy
  pullPolicy: IfNotPresent

Updated Values

upstream:
  tempo:
    # -- Docker image repository
    repository: registry1.dso.mil/ironbank/opensource/grafana/tempo
    # -- Docker image tag
    tag: 2.7.2
    # -- Docker image pull policy
    pullPolicy: IfNotPresent

Please note this does not apply to Big Bang specific top level keys including domain, sso, istio, networkPolicies, bbtests, and waitJob.

Important: As part of this passthrough pattern refactor mentioned above, changes to the tempo package, upgrading to 1.21.1-bb.3 could involve changes to immutable fields that requires the tempo-tempo statefulset to be deleted before upgrading the release.

The Tempo upgradeJob field in values.yaml can deploy a pre-upgrade job that automates the required statefulset deletion without any additional steps by using a helm pre-upgrade hook, so no additional actions is required. It should be noted, a brief outage is expected during upgrade while the tempo-tempo statefulset is being rolled out.

However, if you would rather manually delete the tempo-tempo statefulset prior to upgrade, then you would need to set the upgradeJob.enabled=false in the values.yaml and follow steps outlined below. The below command assumes that the Tempo package is deployed in the default Big Bang tempo namespace and tempo-tempo statefulset name for Tempo, one should look to confirm the namespace and name of their Tempo statefulset:

kubectl delete statefulset -l app.kubernetes.io/instance=tempo-tempo -n tempo

Once the resources have been deleted, you can upgrade the release.