feat(health-monitor): host-side silent-fail detection and operator alerting#2498
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feat(health-monitor): host-side silent-fail detection and operator alerting#2498alexli-77 wants to merge 1 commit into
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This was referenced May 16, 2026
…erting
Detects "can't run" level failures that the existing stuck-container
detection misses: sessions that produce a processing_ack=completed but
zero messages_out in the same 2-hour window — the signature of a silent
OAuth 401 auth failure swallowed by the agent-runner.
New module: src/modules/health-monitor/
- setup.ts: idempotent DB bootstrap — agent group, Discord messaging
group, wiring, named 'keepalive' destination. Discord guild/channel
IDs read from HEALTH_MONITOR_DISCORD_GUILD_ID and
HEALTH_MONITOR_KEEPALIVE_CHANNEL_ID in .env.
- checks.ts: checkSilentFail() (ack=completed + messages_out=0 in 2h,
container stopped) + checkTokenExpiry() (minutesLeft < 60)
- alert.ts: direct Discord REST POST to keepalive channel (bypasses
nanoclaw routing, fires even when the host is degraded) + task
injection into the health-monitor agent session for investigation
- index.ts: 5-min timer, 1h dedup per issue key, startHealthMonitor()
(must run after initDb)
src/index.ts: MODULE-HOOK to start health-monitor after DB init
src/modules/index.ts: import health-monitor module
src/container-runner.ts: pre-spawn Keychain copy — reads
'Claude Code-credentials' before every container spawn so the
claude.json always reflects the current token
Upstream issues: nanocoai#730 (token expiry), nanocoai#2492 (health-monitor proposal)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
src/modules/health-monitor/module: 5-min timer that detects silent task failures and posts direct Discord alertsbuildMounts()Problem
Stuck-container detection catches hung containers but misses containers that complete with zero output — the silent 401 auth failure pattern:
processing_ack = completed(processed the message, result was empty)absolute-ceilingkills itChanges
src/modules/health-monitor/(new module):setup.ts— idempotent DB bootstrap (agent group + messaging group + wiring + named destination)checks.ts—checkSilentFail()(ack with no output in 2h window, container stopped) +checkTokenExpiry()alert.ts— direct Discord REST to configurable keepalive channel (bypasses routing — works even if routing is broken) + task injection into health-monitor sessionindex.ts— 5-min timer, 1h dedup per issue key,startHealthMonitor()called afterinitDb()via MODULE-HOOKsrc/container-runner.ts: pre-spawn Keychain token refresh inbuildMounts(). try/catch, no-op on non-macOS.src/index.ts+src/modules/index.ts: MODULE-HOOK wiring.Test plan
[health-monitor] Startedin logs<message to="keepalive">to Discordpnpm run buildpassesRelated upstream issues
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