Description
Component(s)
exporter/kafka
Is your feature request related to a problem? Please describe.
We have a need to route in tenant-specific Kafka topics, similar to the approach described at https://kafka.apache.org/documentation/#multitenancy-topic-naming.
There are arbitrarily many ways one might want to route data, and these apply to other components, so this is best left to another component -- see #39199 for a proposal. That proposal involves injecting the topic name into request metadata, which can then be referenced by the Kafka exporter.
Describe the solution you'd like
As described in #38888 (comment), I would like to introduce a configuration setting for extracting the topic name from request metadata.
Concretely, we should build on #39204 and introduce additional signal-specific topic_from_metadata settings (alternative name welcome).
Describe alternatives you've considered
Originally I thought of making the topic name templated, as described in #38888.
Additional context
No response