15 lines
634 B
Markdown
15 lines
634 B
Markdown
Add session registration history.
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Setting config `broker.session_history_retain` allows EMQX to keep track of expired sessions for the retained period.
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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).
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A new gauge `cluster_sessions` is added to the metrics collection. Exposed to prometheus as
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```
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# TYPE emqx_cluster_sessions_count gauge
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emqx_cluster_sessions_count 1234
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```
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NOTE: The counter can only be used for an approximate estimation as the collection and calculations are async.
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