Multi tenant aware grafana agent

[martinjaegerdk]

Request

As far as i can tell, the agents support for multi tenancy is limited to static configuration. Either through adding a custom HTTP header for remote write configurations, or setting tenant_id attribute where that is supported.

I have a few use cases, where i would like for the grafana-agent to support dynamic multi tenancy. E.g. setting tenant_id/HTTP Header based on a label value.

Use case

Having a common agent that can support scraping data for multiple tenants.