#84327 excluded _spawn_supervised's permanent watchers (session-expiry,
kanban, reconnect, the scale-to-zero watcher itself, ...) from
_scale_to_zero_has_live_background_work() via a _hermes_supervised_watcher
tag, because counting them made an armed gateway consider itself busy
forever and never go dormant.
Two more permanent, infinite-loop tasks are added to _background_tasks
OUTSIDE _spawn_supervised and were untagged:
- _loop_heartbeat_task (loop_heartbeat_forever, #66892): a `while True`
loop started unconditionally in start() on every gateway boot. Extracted
the inline spawn block into _start_loop_heartbeat_task() so it's
independently testable, matching the existing _start_heartbeat_poller()
pattern.
- _heartbeat_poll_task (_poll_loop in _start_heartbeat_poller): also a
`while True` loop, started the first time a session registers a
heartbeat watch, and then permanent for the rest of the process.
Because _loop_heartbeat_task starts on every boot, it alone made
_scale_to_zero_has_live_background_work() return True forever on every
armed instance, regardless of the #84327 fix -- confirmed empirically
against the real method with the exact untagged-task shape this task has.
Two new regression tests spawn each task through its real production
entry point and assert the busy check returns False; both fail against
the unfixed code (missing method / real assertion failure).
Co-authored-by: pierrenode <298902573+pierrenode@users.noreply.github.com>
Co-authored-by: Ben Barclay <ben@nousresearch.com>
pierrenode
a1ddb54840