Horizon Monitor

The Horizon monitor reads Horizon’s Redis keys directly – the same data source the Horizon dashboard uses.

What it monitors

Signal	How
Overall status	horizon:status Redis key
Per-supervisor state	horizon:{id}:supervisor heartbeat timestamp
Paused state	horizon:status = paused
Failed jobs per minute	horizon:{id}:{queue}:throughput buckets

Configuration

config/crontinel.php

'horizon' => [
    'enabled' => true,
    'supervisor_alert_after_seconds' => 60,
    'failed_jobs_per_minute_threshold' => 5,
    'connection' => 'horizon', // Redis connection used by Horizon
],

What “supervisor down” means

Crontinel tracks each supervisor separately via its heartbeat. If a supervisor’s lastHeartbeat is more than supervisor_alert_after_seconds old, Crontinel considers it down – even if the top-level horizon:status key still says running.

This is the key difference from generic monitors: you get an alert for a supervisor crash in the emails queue while your default queue supervisor is still healthy.

Disabling

If you don’t use Horizon:

'horizon' => ['enabled' => false],

Queue and cron monitoring continue to work independently.