Add the job and instance labels to resource attributes

[chenlujjj]

Component(s)

receiver/prometheus

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

We are moving from prometheus to otel-collector to collect metrics, but the metrics collected by prometheus receiver don't have job and instance labels any more, which are default labels for prometheus metrics( see https://prometheus.io/docs/concepts/jobs_instances/) and used by many popular dashboards and alert rules.

Describe the solution you'd like

Add the job and instance labels to resource attributes.
A few lines of codes in https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/prometheusreceiver/internal/prom_to_otlp.go#L35 can solve this.

Describe alternatives you've considered

No response

Additional context

It can be optional

[github-actions]

Pinging code owners:

• receiver/prometheus: @Aneurysm9 @dashpole

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

[dashpole]

OpenTelemetry uses service.instance.id and service.name. Prometheus exporters rename these to job and instance per the specification. You can also use the resource processor to rename from service.instance.id and service.name to job and instance if you want.

[chenlujjj]

@dashpole Thanks for your answer, the resource processor can solve this.