emqx4.3/changes/ce/feat-12299.en.md

Expose more metrics to improve observability:

Montior API:

• Add retained_msg_count field to /api/v5/monitor_current.
• Add retained_msg_count and node_uptime fields to /api/v5/monitor_current/nodes/{node}.

Prometheus API:

• Add emqx_cert_expiry_at to /api/v5/prometheus/stats to display TLS listener certificate expiration time.
• Add /api/v5/prometheus/auth endpoint to provide metrics such as execution count and running status for all authenticatiors and authorizators.
• Add /api/v5/prometheus/data_integration endpoint to provide metrics such as execution count and status for all rules, actions, and connectors.

Limitations: Prometheus push gateway only supports content in /api/v5/prometheus/stats?mode=node for now.

For more API details and metric type information. Please see also in swagger api docs.