Missing "stream" metric label in Streams Mode

[m-arre]

In Streams Mode, the stream label is missing from processor_resources. Without this label, differentiating metrics across multiple streams becomes impossible.
It would be greatly appreciated to have entries for the pipeline processors of type resource, which currently do not emit any metrics. This would certainly serve as a workaround.

processor_received{instance="worker-2", path="root.pipeline.processors.0", stream="abc"} 21
processor_received{instance="worker-2", path="root.pipeline.processors.15", stream="abc"} 0
processor_received{instance="worker-2", path="root.pipeline.processors.16", stream="abc"} 0
...
processor_received{instance="worker-2", path="root.processor_resources.branch.processors.0"} 21
processor_received{instance="worker-2", path="root.processor_resources.branch.processors.0.try.0"} 21
processor_received{instance="worker-2", path="root.processor_resources.branch.processors.0.try.1"} 18
...