Passenger Exporter

Passenger exporter is a Prometheus metrics exporter for Phusion Passenger 6.0.

Usage

Running locally

Start Passenger with a known instance registry:

$ PASSENGER_INSTANCE_REGISTRY_DIR=/tmp/passenger passenger start

Run the exporter, specifying the same instance registry:

$ PASSENGER_INSTANCE_REGISTRY_DIR=/tmp/passenger ./bin/passenger-exporter

Note: You must specify the PASSENGER_INSTANCE_REGISTRY_DIR environment variable. It is used by the passenger-status command to query Passenger information. Without it, the exporter cannot retreve metrics from your Passenger instance.

Flags

The following flags are available:

Flag	Description	Default Value
-passenger.command string	Passenger command for querying passenger status.	"passenger-status --show=xml"
-passenger.command.timeout-seconds float	Timeout for passenger.command.	5
-web.listen-address string	Address to listen on for web interface and telemetry.	":9149"
-web.telemetry-path string	Path under which to expose metrics.	"/metrics"

Building

1. Clone the repository.
2. Install the promu build tool.
3. Install application dependencies via make dependencies (they'll be placed in ./vendor).
4. Build and install the binary with make build.
5. Run the command e.g. ./bin/passenger-exporter -h.

Testing

1. Install the golangci-lint, see instructions here.
2. Run linter using make lint and test using make test.

The scrape output can be regenerated by passing the --golden flag to go test.

Credits

We would like to acknowledge and express our gratitude to @stuartnelson3 for their work on the upstream version of Passenger Exporter.