Check Types

Mode	Where it runs
Dashboard	Executed by the dashboard worker container. Tests things reachable over the network from the watchdog server.
Agent	Requires direct host access. Runs on an agent with the correct volumes and pid namespace configured.
Dashboard or Agent	Network-level check. Can run from either the dashboard or any agent.

Check	Type identifier	Runner	Description
HTTP Reachability	`http`	Dashboard	Checks if a URL returns an expected HTTP status code
HTTP Content	`http_content`	Dashboard	Checks the response body for required or forbidden strings
SSL Certificate	`ssl_cert`	Dashboard	Monitors TLS certificate expiry across multiple hosts
Docker Container Health	`docker`	Dashboard or Agent	Checks if a container is running and healthy via Docker socket
Docker Exec	`docker_exec`	Dashboard or Agent	Runs a command inside a container and checks the exit code
Disk Space	`disk_space`	Agent	Monitors disk usage percentage with warn and fail thresholds
Load Average	`load_average`	Agent	Monitors system load relative to CPU count
Process Running	`process`	Agent	Checks if a named process is running via `pgrep -f`
Log File	`log_file`	Agent	Checks that a log file was updated recently and contains a required pattern
File Age	`file_age`	Agent	Monitors how recently a file was modified — ideal for backup health checks
File Size	`file_size`	Agent	Checks that a file is within a defined size range
TCP Port	`tcp_port`	Dashboard or Agent	Checks if a TCP port is open and accepting connections
Redis	`redis`	Dashboard or Agent	Sends PING to a Redis server and verifies the PONG response
Database	`database`	Dashboard or Agent	Opens a PDO connection to verify database reachability

¶ Check Types