Why three check-in states for long jobs

in_progress tells Sentry work started so max runtime clocks from execution not from schedule alone. ok closes the run. error marks failure even when wall clock stayed inside the margin.

How do silence windows interact with Cron Monitors

Mute or pause the monitor in Sentry for planned maintenance and short-circuit local wrappers with the same UTC range so you do not send misleading ok or error pings during intentional downtime.

Is the check-in URL a secret

Treat it like a capability URL. Restrict file permissions, avoid browser bookmarks on shared machines, and rotate if it leaks because anyone who can POST can spoof status without your logs.

What if runtime exceeds max runtime occasionally

Raise max runtime to cover p99 duration, split the job into segments each with its own monitor, or send mid-run in_progress heartbeats if your workload supports checkpoints.

2026 OpenClaw Rent Mac Mini in Production: Sentry Cron Monitors, Check-In Heartbeats, Silence Windows, Gateway Logs & Backoff Alerts

May 7, 2026

RunMini Tech Team

Read time: 7 mins

When you rent a Mac Mini for OpenClaw and multi-hour night batches, a process exit code alone is a weak signal: the host might be healthy while work stalls inside a queue, or the gateway might restart mid-run. Sentry Cron Monitors add a first-class long-running observability layer—missed check-ins, explicit failures, and timelines that survive log rotation.

This article is a minimal reproducible path: create the monitor, call the heartbeat check-in URL with in_progress, ok, and error, align UTC silence windows with your wrapper and Sentry maintenance, correlate OpenClaw gateway logs with the same batch_id, and cap exponential backoff on auxiliary webhooks so Sentry stays the source of truth. Cross-read the dashboard and night-batch runbook, cron fan-out with backoff, gateway upgrade and rollback, daemon health checks, and the batch decision matrix for queue and memory policy. Use Home, Help Center, and the blog index when you need navigation context.

OpenClaw 2026.5.x on the rental host (short)

Pin OpenClaw 2026.5.x in whichever channel you trust (installer manifest, package lockfile, or pinned git tag). Keep a dedicated OPENCLAW_HOME per lane, run the project’s doctor or preflight command once after install, bind the gateway to a stable loopback or tenant port, and register only one launchd label per script to avoid duplicate night fires. Treat upgrades as a small blast radius: snapshot config, roll forward, and keep the rollback notes from the gateway guide handy if TLS or upstream API defaults shift between patch releases.

Cron Monitor configuration

In Sentry, create a Cron Monitor under the same project that already receives your application events (optional but convenient). Match the schedule to the launchd StartCalendarInterval or crontab line. Set check-in margin wide enough for cold caches after reboot, and set max runtime from measured duration: use your last week of logs, take p95 wall time, then add twenty to forty percent headroom for disk contention on a shared rental fleet.

Field	Practical starting point
Slug / name	Include tenant, lane, and job, e.g. `runmini_openclaw_night_sync_a`
Schedule	Same UTC expression as launchd; document DST policy (prefer pure UTC)
Check-in margin	Covers scheduler jitter and brief host wake delay
Max runtime	p95 duration plus headroom; raise when jobs legitimately grow
Environment	Separate `production` vs `staging` monitors even on the same host class

Heartbeat URL and shell wrapper

After saving the monitor, Sentry shows an ingest check-in URL for your organization and project. The exact path evolves with Sentry releases; copy it from the UI rather than guessing. Typical usage from macOS is a curl POST with application/json body {"status":"in_progress"}, then {"status":"ok"} on success, or {"status":"error"} on failure. Some setups also accept a status query parameter—prefer JSON for clarity.

Store SENTRY_CRON_URL (or the UI-provided variable name) in root-only launchd EnvironmentVariables, the macOS Keychain, or a mode 0600 file outside git. At the top of your batch wrapper, send in_progress immediately so max runtime measures execution, not queue wait. Use trap on ERR and EXIT so hard kills still attempt error once.

#!/bin/bash
set -euo pipefail
MONITOR_SLUG="runmini_openclaw_night_sync_a"
BATCH_ID="$(date -u +%Y%m%dT%H%M%S)-$$"
export BATCH_ID MONITOR_SLUG
curl -fsS -X POST -H 'Content-Type: application/json' \
  --data '{"status":"in_progress"}' "$SENTRY_CRON_URL" || true
trap 'curl -fsS -X POST -H "Content-Type: application/json" \
  --data "{\"status\":\"error\"}" "$SENTRY_CRON_URL" || true' ERR
# ... your OpenClaw dispatch / worker command ...
curl -fsS -X POST -H 'Content-Type: application/json' \
  --data '{"status":"ok"}' "$SENTRY_CRON_URL"

The snippet is illustrative: tighten error handling for production, add timeouts to curl, and log the same BATCH_ID to stdout (see below).

Silence windows (Sentry + host + OpenClaw)

Long-running observability fails when maintenance looks like an incident. Pick one UTC window and apply it everywhere: mute or pause the Cron Monitor in Sentry, set MAINTENANCE_UNTIL=… (or a small plist flag) read by your wrapper so it exits zero without sending misleading ok check-ins, and optionally tell OpenClaw’s gateway to downgrade outbound noise during the same slice. When the window ends, re-enable the monitor before the next scheduled tick so the first real run is still supervised. Document the policy beside your night-batch runbook so on-call knows silence is intentional.

Gateway log linkage

Sentry answers “did the schedule complete?”; OpenClaw gateway logs answer “what did the gateway think happened?” Emit structured fields on every relevant line: batch_id, monitor_slug, window_utc, and a short phase for multi-step imports. Operators can then grep batch_id across StandardOutPath, OPENCLAW_HOME logs, and forwarded JSON without guessing which restart belonged to which run. After gateway upgrades, compare log field names against the upgrade and rollback notes so dashboards do not silently break.

Minimal checklist

Create the Cron Monitor with schedule, margin, and max runtime derived from real timings.
Secure the check-in URL in launchd env or Keychain; use mode 0600 on any file that holds it.
Wrap the batch: in_progress at start, ok at the end, error on failure paths and traps.
Log batch_id and monitor_slug from the wrapper and ensure the gateway echoes them.
Silence with the same UTC range in Sentry and the wrapper during maintenance.
Backoff secondary webhooks (Slack, SMS) with jitter; let Sentry own missed check-ins.
Schedule with launchd; avoid duplicate cron entries for the same path.
Tabletop slow runs and network loss to verify timelines and log correlation.

FAQ

Do I still need local log tailing if Sentry is green?: Yes. Cron Monitors prove cadence and terminal status, not data correctness. Keep disk and queue probes from the daemon health article for degraded-but-not-failed scenarios.
Where does backoff apply if Sentry already alerts?: Use backoff on additional channels so a single Sentry issue does not fan out into dozens of Slack retries. Retry Sentry check-ins only cautiously with short timeouts so a stuck client does not hold workers open.
Can one monitor cover multiple scripts?: Only if one wrapper owns the full logical job. Different scripts on different schedules should get different monitors; otherwise a fast subtask can mark ok while a slower sibling is still running.
How tight should max runtime be for variable imports?: Prefer checkpoints and segment monitors over a razor-thin max runtime. If variance is huge, split the pipeline so each stage has its own Sentry timeline.

Rent a Mac Mini for OpenClaw + overnight observability

RunMini Apple Silicon nodes fit this pattern: start at Home, read Help, browse the blog, then open checkout—you can complete rental without logging in when your flow allows guest purchase; use Pricing to compare plans first.

View Plans Rent Now Help Center

Bookmark Home and Blog before you rely on Sentry as the night-shift pager.