📈Prometheus Metrics

soketi has a Prometheus exporter built-in with a list of metrics that can help you have a better overview of the cluster and connections. To get started, enable the feature in soketi via the METRICS_ENABLED environment variable and set up your own Prometheus server to scrape the HTTP REST API of each node that soketi runs on.

soketi publicly exposes the WebSockets & HTTP REST API servers on port 6001.

The metrics are served on port 9601, which is not publicly exposed to the Internet by default so that the sensitive metrics will not require the complexity of an authentication system. Therefore, you may easily scrape the metrics from your private network or from the same server instance the soketi server runs on.

When configuring your firewalls, keep in mind that you should let users access port 6001 from the Internet (so that messages can be broadcast), but not port 9601.

Enabling Metrics

You may use the the METRICS_ENABLED environment variable to enable the metrics server.

SOKETI_METRICS_ENABLED=1 soketi start

curl http://127.0.0.1:9601/metrics

A small sample of metrics output can be found below. The exposed metrics are for both soketi connections and apps, as well as the Node.js built-in Prometheus metrics regarding the running processes, memory, and CPU usage that can be useful for autoscaling or monitoring the running instance.

# HELP soketi_6001_connected The number of currently connected sockets.
# TYPE soketi_6001_connected gauge

# HELP soketi_6001_new_connections_total Total amount of soketi connection requests.
# TYPE soketi_6001_new_connections_total counter

# HELP soketi_6001_new_disconnections_total Total amount of soketi disconnections.
# TYPE soketi_6001_new_disconnections_total counter

# HELP soketi_6001_socket_received_bytes Total amount of bytes that soketi received.
# TYPE soketi_6001_socket_received_bytes counter

...

Prometheus Metrics Environment Variables

Name	Default	Possible values	Description
SOKETI_METRICS_ENABLED	false	true, false	Whether to enable metrics. For Prometheus, enabling this option will expose a /metrics endpoint.
SOKETI_METRICS_SERVER_PORT	9601	Any number	The metrics server port. For security, this port should not be exposed to the Internet.
SOKETI_METRICS_DRIVER	prometheus	prometheus	The driver used to scrape metrics. For now, only prometheus is supported.
SOKETI_METRICS_PROMETHEUS_PREFIX	soketi_	Any string	The prefix to add to the metrics in Prometheus to differentiate from other metrics in Prometheus.