Inspect and export Zotonic metrics
Discover actual metrics before configuring subscriptions.
Zotonic collects metrics through Exometer. Connect to the running node with bin/zotonic shell and list the available metrics for a site:
exometer:find_entries([site, garden]).
Use a name from that result with exometer:info(Name, datapoints) and exometer:get_value(Name). Generate a few requests and repeat the read to confirm the metric changes. Press Ctrl-C twice to leave the remote shell.
Current site metrics use [site, Site, System, What]; the old [zotonic, Site, webzmachine, requests] examples are not a reliable subscription target. Counters/rates and duration histograms expose different datapoints. Discover them instead of subscribing to value everywhere.
For export, choose a reporter that is actually installed with your deployment. Inspect the dependency version's reporter options and configure it under exometer_core in erlang.config, then subscribe to the selected names and datapoints. Zotonic also has its own MQTT statistics reporter; see z_stats and z_exometer_mqtt for the installed implementation.
Test that the destination receives samples with the expected units, site labels and interval. Shell-only reporter changes disappear after restart. Do not assume a third-party Graphite, StatsD or SNMP reporter is bundled merely because an old cookbook listed it.