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docs: add tidb_enable_connection_event_log system variable #23278

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Update system-variables.md
gengliqi Jul 16, 2026
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- Default value: `ON`. Before v8.3.0, the default value is `OFF`.
- This variable controls whether to enable TiDB to collect `PREDICATE COLUMNS`. After enabling the collection, if you disable it, the information of previously collected `PREDICATE COLUMNS` is cleared. For details, see [Collect statistics on some columns](/statistics.md#collect-statistics-on-some-columns).

### tidb_enable_connection_event_log <span class="version-mark">New in v8.5.8 and v9.0.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Boolean
- Default value: `OFF`
- This variable controls whether to write successful client login and logout events to the TiDB log.
- If your workload frequently creates and closes connections, enabling this variable can generate a large number of log entries.

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[PingCAP.Ambiguous] Consider using a clearer word than 'a large number of' because it may cause confusion.

Raw Output:
{"message": "[PingCAP.Ambiguous] Consider using a clearer word than 'a large number of' because it may cause confusion.", "location": {"path": "system-variables.md", "range": {"start": {"line": 2175, "column": 99}}}, "severity": "INFO"}

### tidb_enable_enhanced_security

- Scope: NONE
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