Support resource detectors for service telemetry

[iblancasa]

Component(s)

service

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

The collector's self-observability telemetry doesn't use resource detectors, which means:

1. Environment variables don't work: OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME are ignored (see [telemetry] Add OTEL_RESOURCE_ATTRIBUTES to otlp-emitted metrics #10909).
2. Cloud metadata requires manual config: when running on AWS/GCP/Azure, you have to manually configure all the cloud attributes (region, account, instance type, etc.) instead of auto-detecting them.
3. Host information missing: basic stuff like host.id that could be auto-detected requires manual setup.

Describe the solution you'd like

Since this is something that is available as part of the go-sdk, I would like to see a detectors new field under .service.telemetry that allow enabling the detectores available in the go sdk.

Describe alternatives you've considered

No response

Additional context

No response

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[axw]

I haven't tested it, but there's a detection/development field that we should probably align with: https://github.com/open-telemetry/opentelemetry-configuration/blob/ddc8c8f47085eb5637a4b1e084b65e384521f8b9/schema/resource.yaml#L12-L16

That only supports container, host, process, and service detectors at the moment, though -- no cloud.

Describe alternatives you've considered
No response

The alternative is to send telemetry to another local collector to enrich. Probably not ideal, but it's an option.

[iblancasa]

I haven't tested it, but there's a detection/development field that we should probably align with: https://github.com/open-telemetry/opentelemetry-configuration/blob/ddc8c8f47085eb5637a4b1e084b65e384521f8b9/schema/resource.yaml#L12-L16

That only supports container, host, process, and service detectors at the moment, though -- no cloud.

Interesting. I will take a look. Thanks!