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docs: add changelog for #12326

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Zaiming (Stone) Shi 2024-01-19 17:44:49 +01:00
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Add session registration history.
Setting config `broker.session_history_retain` allows EMQX to keep track of expired sessions for the retained period.
API `GET /api/v5/sessions_count?since=1705682238` can be called to count the cluster-wide sessions which were alive (unexpired) since the provided timestamp (UNIX epoch at seconds precision).
A new gauge `cluster_sessions` is added to the metrics collection. Exposed to prometheus as
```
# TYPE emqx_cluster_sessions_count gauge
emqx_cluster_sessions_count 1234
```
The counter can only be used for an approximate estimation as the collection and calculations are async.