Passenger Exporter

Export Passenger metrics to Prometheus.

To run it:

make
./passenger_exporter [flags]

Exported Metrics

Metric	Meaning	Type
passenger_up	Passenger state.	Gauge
passenger_version	Phusion Passenger version.	Gauge
passenger_top_level_queue	Number of requests in the top-level queue.	Gauge
passenger_max_processes	Configured maximum number of processes.	Gauge
passenger_current_processes	Current number of processes.	Gauge
passenger_app_count	Number of apps.	Gauge
passenger_app_queue	Number of requests in app process queues.	Gauge
passenger_app_group_queue	Number of requests in app group process queues.	Gauge
passenger_app_procs_spawning	Number of processes spawning.	Gauge
passenger_requests_processed_total	Number of processes served by a process.	Counter
passenger_current_sessions	Number of sessions currently being handled by a process.	Gauge
passenger_proc_start_time_seconds	Number of seconds since processor started.	Gauge
passenger_proc_memory	Memory consumed by a process.	Gauge

Flags

./passenger_exporter --help

• passenger.instance-registry: Path to the instance registry directory. (default: /tmp)
• passenger.pid-file: Optional path to a file containing the passenger/nginx PID for additional metrics.
• log.format: Output format of log messages. One of: [logfmt, json] (default: logfmt).
• log.level: Only log messages with the given severity or above. One of: [debug, info, warn, error] (default: info).
• web.listen-address: Addresses on which to expose metrics and web interface. Repeatable for multiple addresses (default: :9144).
• web.telemetry-path: Path under which to expose metrics (default: /metrics).
• version: Show application version.

Using Containers

You can run this exporter using the ghcr.io/nex-health/passenger-exporter container image.

docker run -d \
           -p 9149:9149 \
           -v /path/to/passenger-inst-reg-dir:/var/run/passenger-instreg:ro \
           -v /path/to/passenger.pid:/tmp/passenger.pid:ro \
           ghcr.io/nex-health/passenger-exporter \
             --passenger.pid-file /tmp/passenger.pid \
             --passenger.instance-registry /var/run/passenger-instreg