Expand labels recorded for single saturation point
This is extracted from #3390 to allow for a smaller step to try this out.
In this issue, we'd like to pick one saturation point (ideally related to ai-gateway and code suggestions) as an example and expand the recording rule to include labels for relevant dimensions.
This allows us to learn how this could work and potentially what effects additional labels on saturation metrics have.
Edited by Andreas Brandl