Create features section in Tempo config

[yvrhdn]

Is your feature request related to a problem? Please describe.
Tempo is gradually gaining optional features/components that can be enabled/disabled globally. We already have search_enabled and #1282 adds metrics_generator_enabled.

These toggles control major features usually impacting multiple components.

Describe the solution you'd like
To make it easier to find these toggles we can group them in a global section features, i.e.:

features:
  multitenancy_enabled: true
  search_enabled: true
  metrics_generator_enabled: false

Describe alternatives you've considered
We can just not do this and keep the status quo:

multitenancy_enabled: true
search_enabled: true
distributor:
  metrics_generator_enabled: true
  # ...

Or move them all to the top-level:

multitenancy_enabled: true
search_enabled: true
metrics_generator_enabled: true

This is probably fine for now but might become impractical if we add many toggles 🤷🏻

Additional context

[github-actions]

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[ishanjain28]

Hi @kvrhdn, It looks like this issue is stale now.
search_enabled, metrics_generator_enabled flags were removed from tempo a while back.

Only multitenancy_enabled is left and it's a top level flag already

[yvrhdn]

Yeah, features come and go. Search and metrics-generator are now enabled by default, we had another temporary flag autocomplete_filtering_enabled that very recently got removed.
I think the original request of putting these flags in a features section is still fine though, we just don't really care enough about it to do the breaking changes.