Watchdog

Feature	Details
Check types	14 built-in types: HTTP, HTTP Content, SSL, DNS, TCP, Docker, Docker Exec, disk space, load average, process, log file, file age, file size, Redis, database
Agent-based monitoring	Lightweight Docker agent for remote/customer servers — fetches checks from dashboard, pushes results back
Alert logic	Email alerts on status transitions only (ok→fail, fail→ok) — no repeated spam
No external dependencies	SQLite database, FrankenPHP all-in-one binary — no MySQL, no Redis, no separate web server
Async execution	Symfony Messenger for non-blocking check dispatch and email delivery
Scheduler	Symfony Scheduler for interval-based and time-based check execution

Container	Purpose
`app`	FrankenPHP web server — UI and REST API
`worker`	Messenger consumer — executes dashboard checks, sends alert emails
`scheduler`	Triggers due checks on configured intervals
`agent`	Runs agent-mode checks locally and pushes results to the dashboard
`mailpit`	Local mail catch-all (dev/stage only)

¶ Watchdog