[cmd/mdatagen] Provide config with all metrics disabled

[braydonk]

Component(s)

cmd/mdatagen

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

There are some scenarios where it would be nice to easily receive a metric builder config with all metrics disabled. (Example scenario in Additional Context)

Describe the solution you'd like

I would like to add a new function called DefaultMetricsConfigAllDisabled (or something to that effect) to the generation template that will provide a metric builder config with all metrics disabled.

Describe alternatives you've considered

Currently the only way to do this is to get a default config and manually set all the metrics enabled fields to false, or to use reflection.

Additional context

I encountered a scenario in #30894 where this would have been useful. I would have liked to be able to provide a test where only 2 of the metrics in the config were enabled, but it would have been very repetitive to write disabling every other metric. This also applies to how I would have liked to provide fields on the processscraper config that might enable/disable groups of metrics for convenience.

[github-actions]

Pinging code owners:

• cmd/mdatagen: @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[braydonk]

I know this is moving to collector core soon, but I opted to open the issue and PR here for now and will move it over if/when needed.

[crobert-1]

Sounds good to me, removing needs triage.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

[braydonk]

Closing in favour of open-telemetry/opentelemetry-collector#10074