Description

Some issues will be encountered when running our tests with Helm 4.x. This ticket consolidates these in one place.
The issues mentioned below will require updates to operator-templating (for Tilt) and changing test definitions so that they run with Helm 4.x.

Tasks

N.B. this list is not exhaustive and can/should be extended as necessary.

Tilt

When deploying Tilt using Helm 4.x the following error occurs:

Initial Build
Loading Tiltfile at: /home/andrew/gitrepos/airflow-operator/Tiltfile
ERROR: Traceback (most recent call last):
  /home/andrew/gitrepos/airflow-operator/Tiltfile:40:8: in <toplevel>
Error in helm: exit status 1

• investigate what is causing this
  • Cause: Tilt not working with Helm 4 because the --client flag was removed from the version sub-command tilt-dev/tilt#6635
  • See also: https://helm.sh/docs/changelog/ (#31301)
  • Tilt update (helm.go, line 96): https://github.com/tilt-dev/tilt/pull/6638/changes referenced in 0.36 release notes
• implement solution in operator templating and roll out to all operators
  • Nix references Tilt 0.36 here: NixOS/nixpkgs@a5029a0
  • run niv update crate2nix and niv update nixpkgs in templating and roll out
  • this was done in feat: Use UBI10 rust builder operator-templating#580

3rd party chart warnings

Some warnings marked as deprecated and tolerated with Helm 3.x will now cause errors.
e.g. for bitnami/minio we have:

extraEnvVars:
  - name: BITNAMI_DEBUG
    value: "true"

the warning with Helm 3.x

I0108 16:56:21.615903  781766 warnings.go:110] "Warning: spec.template.spec.containers[0].env[11]:
hides previous definition of \"BITNAMI_DEBUG\", which may be dropped when using apply"

will now trigger an error in Helm 4.x:

Error: INSTALLATION FAILED: failed to create typed patch object
(kuttl-test-up-cattle/minio; apps/v1, Kind=Deployment):
.spec.template.spec.containers[name="minio"].env:
duplicate entries for key [name="BITNAMI_DEBUG"]

Remove this and similar env-vars from 3rd party installation values. Test with 4.x:

14:36 $ helm version
version.BuildInfo{Version:"v4.1.1", GitCommit:"5caf0044d4ef3d62a955440272999e139aafbbed", GitTreeState:"clean", GoVersion:"go1.25.7", KubeClientVersion:"v1.35"}

• fix(tests): Helm 4 compatability airflow-operator#751
• commons-operator
• fix(tests): Helm 4 compatability druid-operator#793
• hbase-operator
• hdfs-operator
• fix(tests): Helm 4 compatability hive-operator#681
• kafka-operator
• listener-operator
• nifi-operator
• opa-operator
• fix(tests): Helm 4 compatability opensearch-operator#118
• secret-operator
• fix(tests): Helm 4 compatability spark-k8s-operator#661
• superset-operator
• fix(tests): Helm 4 compatability trino-operator#852
• zookeeper-operator

Acceptance Criteria

• all tests run when using Helm 4.x
• operators can be deployed with Tilt when using Helm 4.x

Release Notes

Not required as the issues are not user-facing (unless they are developing, in which case we should check if we have specified a helm version anywhere and highlight issues that users may encounter).