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Jihyeon Gim
e9a2a2f98b
Rework the publication handoff so a native callback can never execute a sink: the channel buffer absorbs the common case, and a full buffer appends to an overflow list that the worker drains after the channel instead of falling back to inline publication. Queued records accumulate across successive sessions and failed authentications consume no session at all, so capacity accounting cannot bound the backlog; only removing the fallback closes the stall. Drop the now-unused session-limit accessor. Move signature verification back outside the admission barrier: IAM lookups carry no cancellation, so holding the barrier across verification let one stalled lookup defer RC shutdown indefinitely. The handlers enforce admission themselves, and a failure publication checks the drain state before dispatching, so it cannot land after the sinks close. Synchronize metrics producers with Close: the manager now marks itself closed before closing the datapoint channel, and a producer that still races the closure recovers instead of panicking on a send over a closed channel. Exercise real stale tokens in the reservation generation test: the original token attempts both release and publish after a newer claim took over.