emqx4.3/changes/ce/feat-14360.en.md

Added listener shutdown counts labeled by shutdown reason to Prometheus metrics, under the emqx_client_disconnected_reason counters.

Example output:

emqx_client_disconnected_reason{node="emqx@127.0.0.1",reason="takenover"} 1
emqx_client_disconnected_reason{node="emqx@127.0.0.1",reason="kicked"} 1

Currently, this feature is limited to TCP and TLS listeners only.