Support specifying `sessionAffinity` and `sessionAffinityConfig` for ClusterIP services created for Collectors by Operator

[mou]

Component(s)

collector

Is your feature request related to a problem? Please describe.

In some cases, we would like to create a Collector service with sessionAffinity set to ClientIP. But there is no way to specify that parameter in the OpenTelemetry Collector resource. Because the service is managed by the operator and may not be created immediately after the Collector resource is created, there is no way to patch the service during deployment (using Kustomize or similar tools). Also, service might be reconciled by the Operator, and reconciliation might drop the modified attribute.

Describe the solution you'd like

Add the ability to specify sessionAffinity and sessionAffinityConfig in the OpentelemetryCollector resource and support these parameters during the provision of the resource by the operator.

Describe alternatives you've considered

A workaround would be to have a mutating admission webhook to add such parameters to the resource.

An alternative solution is to allow disabling service creation to let the user to provide service, but this will be very error-prone, because slight changes to the Collector definition might cause configuration drift between resources.

Additional context

No response

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[swiatekm]

I don't see any reason not to add this, we already have a few Service-specific attributes in the common part of the CRDs. If anyone wants to contribute this, we'll accept it.