Cron/Job Dead Man's Switch Monitor

Lyrinox JobWatch is a small self-hosted dead man's switch for scheduled work. Jobs call a private heartbeat URL after they finish. The monitor records the check-in, evaluates each job against its own interval and grace window, and marks missed jobs before a silent failure turns into stale data or missing backups.

The first release ships as a single Go binary with a local status page, JSON status API, Prometheus-compatible metrics, persistent state, duration checks, webhook alerts, and local alert command hooks. It is built for operators who want direct control over job monitoring without adding a large SaaS dependency to a small stack.

• Single dependency-free Go binary
• Team tier supports more installations and larger job inventories
• Designed for private infrastructure
• No database required
• Works with cron, systemd timers, scripts, and workers
• Alerts on missed check-ins before customers notice stale work

Technical Details

Audience

Independent SaaS operators, small infrastructure teams, and developers responsible for scheduled jobs.

Use case

Catch silent failures in backups, imports, reconciliation jobs, report generation, cleanup tasks, and scheduled workers.

Compatibility

Runs as a standalone Linux amd64 binary. Heartbeats work from any language or scheduler that can call an HTTP URL.

Supported systems

Linux servers, cron, systemd timers, CI runners, shell scripts, workers, and any job that can make an HTTP request.

Supported formats

Go binary, HTTP heartbeat URLs, JSON configuration, Prometheus-style metrics.

Dependencies

No database is required. Runtime state is stored in a local JSON file. Webhook alerts require outbound HTTP access only when configured.

Support scope

Lyrinox supports the official binary, configuration format, heartbeat API, status API, metrics output, and packaging issues.

Security and data handling

Heartbeat URLs use bearer tokens. Run the monitor on a private network or behind a reverse proxy, and use HTTPS when jobs report across hosts.

Required permissions

Read access to the config file, write access to the state file, and permission to bind the configured listen address.

External services or calls

None by default. Optional alert webhooks make outbound HTTP requests to the configured alert URL.

Copy-ready Examples

curl -fsS "http://localhost:8088/ping/nightly-backup?token=$JOBWATCH_TOKEN&from=$(hostname)&duration_ms=$duration_ms"

lyrinox-jobwatch check -config /etc/lyrinox-jobwatch.json