Peer Stream Statistics Extension

[nibanks]

Describe the feature you'd like supported

Currently we expose a number of (timing) statistics on a stream that is really useful for a sender side, but it doesn't help much for the receiver side:

typedef struct QUIC_STREAM_STATISTICS {
    uint64_t ConnBlockedBySchedulingUs;
    uint64_t ConnBlockedByPacingUs;
    uint64_t ConnBlockedByAmplificationProtUs;
    uint64_t ConnBlockedByCongestionControlUs;
    uint64_t ConnBlockedByFlowControlUs;
    uint64_t StreamBlockedByIdFlowControlUs;
    uint64_t StreamBlockedByFlowControlUs;
    uint64_t StreamBlockedByAppUs;
} QUIC_STREAM_STATISTICS;

It would be great if we could standardize a solution where the peer could give us its timing values too. This would allow a single side (i.e. the server) to get better understanding of where time is getting spent.

Proposed solution

Define a new QUIC extension to send peer timing statistics on shutdown of the send path of each stream.

Additional context

No response