Setup a Prometheus exporter for Etherpad lite.
You just have to install the plugin and configure your Prometheus server to scrape http://pad.mydomain.org/metrics. Here is an example result :
# HELP etherpad_pads_count Number of pads
# TYPE etherpad_pads_count gauge
etherpad_pads_count{instance="etherpad-test"} 6
# HELP etherpad_blank_pads_count Number of blank pads
# TYPE etherpad_blank_pads_count gauge
etherpad_blank_pads_count{instance="etherpad-test"} 2
# HELP etherpad_connected_users_count Number of connected users
# TYPE etherpad_connected_users_count gauge
etherpad_connected_users_count{instance="etherpad-test"} 1
You can set some specific values on settings.json file :
"ep_prometheus_exporter": {
"instanceName": "INSTANCE LABEL ON METRICS",
"updateInterval": 60
}