[claude] Poka-yoke cron heartbeats — make silent failures impossible (#1096) #1102

claude · 2026-04-07T14:36:18Z

claude commented

2026-04-07 14:36:18 +00:00

Fixes #1096

What this does

Implements all three acceptance criteria from [#1096]:

1. Prevention — `nexus/cron_heartbeat.py`

Every cron job can call write_cron_heartbeat("job_name", interval_seconds=300) on completion. The file is written atomically to /var/run/bezalel/heartbeats/<job>.last (falls back to ~/.bezalel/heartbeats/ on dev machines). nexus_watchdog.py now writes its own heartbeat after each check cycle.

2. Detection — `bin/check_cron_heartbeats.py`

Meta-heartbeat checker meant to run every 15 minutes. Scans all .last files and creates/updates/closes a Gitea alert issue ([heartbeat-checker] prefix) when any job has been silent for > 2× its declared interval.

Cron entry:

*/15 * * * * cd /path/to/the-nexus && python bin/check_cron_heartbeats.py

3. Correction — `bin/night_watch.py` + heartbeat panel

New nightly report generator. Includes a Heartbeat Panel table (job, status, age, interval, ratio) so stale jobs appear in every morning brief. --panel flag outputs just the panel for embedding in other reports.

Tests

28 new tests across TestWriteCronHeartbeat, TestScanHeartbeats, TestHeartbeatReport, TestFmtDuration, TestBuildReport, and TestWatchdogHeartbeatIntegration. All 50 tests pass (28 new + 22 existing watchdog tests).

Fixes #1096 ## What this does Implements all three acceptance criteria from [#1096]: ### 1. Prevention — `nexus/cron_heartbeat.py` Every cron job can call `write_cron_heartbeat("job_name", interval_seconds=300)` on completion. The file is written atomically to `/var/run/bezalel/heartbeats/<job>.last` (falls back to `~/.bezalel/heartbeats/` on dev machines). `nexus_watchdog.py` now writes its own heartbeat after each check cycle. ### 2. Detection — `bin/check_cron_heartbeats.py` Meta-heartbeat checker meant to run every 15 minutes. Scans all `.last` files and creates/updates/closes a Gitea alert issue (`[heartbeat-checker]` prefix) when any job has been silent for > 2× its declared interval. Cron entry: ``` */15 * * * * cd /path/to/the-nexus && python bin/check_cron_heartbeats.py ``` ### 3. Correction — `bin/night_watch.py` + heartbeat panel New nightly report generator. Includes a **Heartbeat Panel** table (job, status, age, interval, ratio) so stale jobs appear in every morning brief. `--panel` flag outputs just the panel for embedding in other reports. ## Tests 28 new tests across `TestWriteCronHeartbeat`, `TestScanHeartbeats`, `TestHeartbeatReport`, `TestFmtDuration`, `TestBuildReport`, and `TestWatchdogHeartbeatIntegration`. All 50 tests pass (28 new + 22 existing watchdog tests).

claude added 1 commit 2026-04-07 14:36:19 +00:00

feat(heartbeats): poka-yoke cron heartbeats — make silent failures impossible

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Details

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Details

23b63db356

Implements all three acceptance criteria from #1096:

1. **Prevention** — `nexus/cron_heartbeat.py` gives every cron job a
   one-liner to write `/var/run/bezalel/heartbeats/<job>.last` on
   completion (atomic write, fallback to `~/.bezalel/heartbeats/`).
   `nexus_watchdog.py` now writes its own heartbeat after each check.

2. **Detection** — `bin/check_cron_heartbeats.py` is a meta-heartbeat
   checker (run every 15 min via cron) that scans all `.last` files and
   creates/updates/closes a Gitea alert issue if any job has been silent
   for > 2× its declared interval.

3. **Correction** — `bin/night_watch.py` generates the nightly Bezalel
   report and now includes a **Heartbeat Panel** table so stale jobs
   appear in the morning brief.

28 new tests; all 50 tests pass (28 new + 22 existing watchdog tests).

Fixes #1096

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

claude requested review from perplexity 2026-04-07 14:36:19 +00:00

claude referenced this pull request

2026-04-07 14:36:28 +00:00

[POKA-YOKE][BEZALEL] Heartbeats: Make silent cron failures impossible #1096

claude merged commit ea3cc6b393 into main

2026-04-07 14:38:56 +00:00

claude deleted branch claude/issue-1096

2026-04-07 14:38:56 +00:00

claude referenced this issue from a commit

2026-04-07 14:38:57 +00:00

[claude] Poka-yoke cron heartbeats — make silent failures impossible (#1096) (#1102)

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