fix(alerts): one offline push per episode, not one per phone nap - #348
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Wiring Telegram made this visible within the hour: seven identical 'worker went offline' pushes in ~80 minutes for one Android phone. The phone was flapping on Android Doze maintenance windows — one heartbeat every ~12 minutes — and the heartbeat route cleared the stored alert on the FIRST beat after offline. Every nap therefore became a brand-new alerted episode: mark offline -> push -> single beat -> clear (re-arm) -> mark offline -> push, forever. The 24h record dedupe never got to hold because its row kept being deleted. Clearing now belongs to the stale-worker sweep alone, and only after the worker stays online for two consecutive sweeps (~4 minutes). A single Doze beat never re-arms — the record cooldown holds and the episode costs ONE push — while a genuinely recovered server re-arms almost immediately. The bell keeps showing the alert through a flap, which is the true state of an unreliable worker. Streaks are in-memory on purpose: a UI restart forgets them, which at worst re-arms one alert early, and every missed clear self-heals within 24h because the record cooldown is measured from the lingering row's own created_at. Pinned end to end in TestFlapDamping (one push per episode, sustained recovery re-arms, streak resets on every flap) and the route test now asserts the heartbeat clears NOTHING; mutation-verified — collapsing the gate to first-sweep clearing turns three tests red.
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📝 WalkthroughWalkthroughOffline-worker alerts now require two consecutive online sweeps before clearing. Heartbeats leave alerts unchanged. Offline transitions reset recovery streaks, failed clears remain retryable, and tests cover flapping and notification deduplication. ChangesOffline-alert recovery
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to If clearing an offline alert fails, the notification state may be removed while the stored alert remains uncleared, leaving stale alerts and preventing later retries. This is a bounded correctness risk that should be fixed or explicitly accepted before merging. Possibly related PRs
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In `@app/main.py`:
- Around line 1047-1054: Track pending durable alert clears independently of
_collector_alerts in the worker collection loop: mark a worker pending when
recovery reaches the clear threshold, reset that state while the worker is
offline, and remove it only after database.clear_alerts("worker", cid) succeeds.
Use the pending state to retry failed clears on later online sweeps even when
bell_lingers is false, while preserving the existing alert removal and logging
behavior. Add a regression test covering a first clear failure followed by a
successful retry on the next online sweep.
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- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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app/main.pytests/conftest.pytests/test_worker_offline_alerts.py
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #348 +/- ##
=======================================
Coverage 95.55% 95.56%
=======================================
Files 51 51
Lines 7250 7259 +9
=======================================
+ Hits 6928 6937 +9
Misses 322 322
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…ll rebuild CodeRabbit's one finding on #348, and it closed the edge the first cut had documented as acceptable: the retry was gated on the in-memory bell entry, which the hourly rebuild derives from OFFLINE workers only — so an online worker whose durable clear failed lost both the bell entry and, with it, the retry, suppressing the next episode's push until the row aged out of the 24h window. The retry state now lives in the streak itself: at or past the threshold the clear runs every sweep until it SUCCEEDS (a raise lands in the per-worker handler and the streak stays armed), and only success parks the streak on a sentinel that the next offline episode resets. Regression tests: a failed clear is retried on the next sweep with the bell entry gone, and a successful clear is never repeated while online. Mutation-verified: parking the sentinel before the clear turns the retry test red.
1 participant
Wiring Telegram notifications made this visible within the hour: seven identical "worker went offline" pushes in ~80 minutes for one Android phone worker (OPPO). The DB held exactly one alert row — the 24h dedupe was fine — but the phone flaps on Android Doze maintenance windows (one heartbeat every ~12 minutes), and the heartbeat route cleared the stored alert on the first beat after offline. Each nap therefore became a brand-new alerted episode: mark offline → push → single beat → clear (re-arm) → mark offline → push, forever. Confirmed in the live log:
marked offline/back onlinealternating every ~12 minutes, onesendMessage200 per cycle.The fix: recovery must be sustained before it re-arms. Clearing now belongs to the stale-worker sweep alone, and only after the worker stays online for two consecutive sweeps (~4 minutes). A single Doze beat never re-arms — the record cooldown holds, so an episode costs ONE push — while a genuinely recovered server re-arms almost immediately. The bell keeps showing the alert through a flap, which is the true state of an unreliable worker.
Deliberate edges: streaks are in-memory (a UI restart forgets them; worst case one alert re-arms early), and any missed clear self-heals within 24h because the record cooldown is measured from the lingering row's own
created_at.Pinned end to end in
TestFlapDamping— one push per episode, sustained recovery re-arms the next episode, streak resets on every flap — and the heartbeat-route test now asserts it clears nothing. Mutation-verified: collapsing the gate back to first-sweep clearing turns three tests red.Summary by CodeRabbit