Add stream state to stream frames #895
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Description
Active stream metrics rely on being able to cancel out counters for open vs error | close, where open counters are triggered by
BEGINframes and error counters are triggered by eitherABORTorRESETframes.Due to the removal of stream handlers when sending
ABORTor receivingRESET, we do not double count these errors.However, there are edge cases where a reply
RESETcan be sent without a corresponding replyBEGIN, making it difficult to get the active count correct without introducing a lot of memory state during the metrics recording.Instead, we can acheive the same goal to expose metrics recording to stream state by encoding the stream state in each stream frame, as a bitset, which will also further assist with diagnostics.