OptionalcancelOptionalcancelHow a cancel tombstone bounds "the cancelled run" so its dying tail cannot resurrect the meter
while a genuinely later run still can. pid (default) suits a local process — one pid per run,
released by a different pid; run suits an edge trigger, whose run is a chain of bounded
invocations each with a fresh pid, so the key is suppressed until the run's terminal status.
OptionalstallMilliseconds a monitor may go without a status update before it is failed as stalled; see DEFAULT_STALL_TIMEOUT_MS. Non-positive or non-finite disables the bound, which leaves a lost terminal pinning its meter open — only appropriate where the producer is in-process and its terminal cannot be lost.
Cancels the process/trigger that emitted progress for a keyed monitor (wired from the process manager).