datadog-opeartor No mechanism exists to enable OTeL Collector for operator versions ~v1.8.0<=x<=v1.11.1

[wspurgin]

Problem

From DataDog/datadog-operator@4bc766f (I believe this is v1.8.0) to the most recent release of this writing (v1.11.1) there is no mechanism to add the command line arg otelEnabled to the deployment created in this chart to enable OTeL support.

e.g., for the latest release of this chart (2.5.0) https://github.com/DataDog/helm-charts/blob/datadog-operator-2.5.0/charts/datadog-operator/templates/deployment.yaml#L104-L137

The arguments passed are tightly controlled by what is present in Values.

Proposal

Expose through Values an additionalCommandArgs that allow users to specify additional flags/args at their own risk. For users of the operator v1.8-v1.11.1 this will allow them to enable OTeL (and any other features currently not configurable through the operator config or the helm chart).

Considerations

Currently in main (but unreleased) the operator adds OTeL as a "default" feature DataDog/datadog-operator#1559, and it removes this arg as a "non-breaking" change. Given that it wasn't exposed, that's probably correct, but the additionalCommandArgs (or whatever it might be called) should likely recommend caution (and perhaps even pinning operator versions) if it's leveraged.