[tempo-distributed] Allow prefixing of rollout-group value and ingester name

[boldfield]

Allow for prefixing both the rollout-group label, name label, and serviceName of the Tempo Ingester StatefulSet, when running in distributed mode, to avoid scheduling and rollout issues when deploying multiple elements of the LTGM stack to a single namespace.

Fixes #3442

[CLAassistant]

All committers have signed the CLA.

[boldfield]

The corollary of this PR for the Loki charts has been merged: grafana/loki#15063

[joe-elliott]

I'm concerned about the complexity this adds to the chart. I would strongly advise not running both Loki and Tempo in the same namespace. Is there a reason to put them in one?

[boldfield]

@joe-elliott we have constraints within our environment that require running the entire LTGM stack in a single namespace and are actively doing it. These changes are opt-in so they will not add additional complexity w/r to users who do not opt to use the feature.

[boldfield]

I also have an alternative solution that can be found here: grafana/rollout-operator#190

[boldfield]

Hi @joe-elliott, any additional thoughts here? The alternative approach was nixed and kustomize isn't an option for us. Thanks.

[danstadler-pdx]

Brian - can you provide any more information here about why a single namespace is needed? thanks