{"Entry":{"collection":"guc","key":"event_source","name":"event_source","aliases":[],"metadata":{"baseline":false,"boot_human":"Not specified","boot_val":null,"category":"Reporting and Logging / Where to Log","category_zh":"","changed_in":[],"changes":[{"documentation_changed":false,"fields":{},"from":"9.1","status":"added","to":"9.2"},{"documentation_changed":true,"fields":{},"from":"12","status":"changed","to":"13"}],"content_hash":"f3478e23f81301892f2c5c54a1822bcb02e0075f3a6cd03e7063c40aaf1d5c94","context":"","default_changed_in":[],"default_history":[{"from":"9.2","to":"19","value":"PostgreSQL"}],"derived_content_hash":"3f789348660782dbbf7c909e2474a2c2addb8311f94a8ecbbb86dcf3c1d67a14","documentation_refresh":{"batch":"20261113","original_source_rev":"wiki-repair-20261023:c9346f5c98b6382ea1cf572dd47281e61a74f1c83c8de89d33ef5f83b1df54f8","versions":{"14":"14.25","15":"15.20","16":"16.16","17":"17.12","18":"18.7","19":"19rc2"}},"editorial":{"advice":{"olap":"Keep the same event source across workload classes so Windows collection rules and dashboards do not fragment by profile.","oltp":"Set event_source only for a Windows eventlog deployment, using a stable non-secret identity registered and routed by the host logging policy.","small":"Leave event_source at its default unless eventlog is selected; changing a dormant label provides no capacity or observability benefit."},"mechanism":["event_source sets the application name used to identify PostgreSQL messages in the event log. This is a Windows event-log identifier and has no effect unless eventlog is an active log destination.","event_source is a POSTMASTER-context setting: PostgreSQL reads it during server startup, and a configuration reload or session SET cannot activate a new value.","event_source is consulted only on Windows when eventlog is selected in log_destination; Windows Event Log registration, permissions, routing, and retention supply the rest of the pipeline."],"pitfalls":["Expecting a reload or SET to activate event_source, although it requires a controlled server restart.","Changing the source name without registering or updating Windows Event Log routing and access policy.","Expecting event_source to have any effect when eventlog is not an active log destination or the platform is not Windows.","Changing event_source globally without a rollback plan and a client or operational compatibility test."],"references":[{"title":"PostgreSQL 19 Beta 4: event_source","url":"https://www.postgresql.org/docs/19/runtime-config-logging.html#GUC-EVENT-SOURCE"},{"title":"PostgreSQL 19 release notes","url":"https://www.postgresql.org/docs/19/release-19.html"}],"related":["logging_collector","log_destination","log_directory","log_filename","log_rotation_age","log_rotation_size"],"summary":"event_source is the PostgreSQL setting that defines the application name used to identify PostgreSQL messages in the event log."},"enumvals":[],"first_version":"9.2","group":"Reporting and Logging","group_slug":"logging","imported_at":"2026-09-30T00:40:57.090909+08:00","intro_commit":{"authored_at":"2011-10-25T20:02:55+02:00","discussion":[],"hash":"d8ea33f2c02721c89c2434b9fda170afb7fe4999","subject":"Support configurable eventlog application names on Windows","url":"https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=d8ea33f2c02721c89c2434b9fda170afb7fe4999"},"key":"event_source","last_version":"20","max_val":"","min_val":"","name":"event_source","position":139,"present_in":["9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19","20"],"repair_provenance":{"original_source_revision":"english-manuals:9d38ce4506557603a0d78ecc57fb5830e2b19d158c8d854737791ee8f07e3b40","receipt_sha256":"f73432549a3c58377b3d63232a6283b2273b1e5f5b8e3a454d949b8289264c78","repair":"wiki-repair-20261023"},"short_desc":"When logging to event log is enabled, this parameter determines the program name used to identify PostgreSQL messages in the log.","short_desc_zh":"","source_rev":"wiki-repair-20261023:c9346f5c98b6382ea1cf572dd47281e61a74f1c83c8de89d33ef5f83b1df54f8","unit":"","vartype":"string"}},"Definition":{"Collection":"guc","Key":"event_source","SourceDatabase":"center","Version":"18","SourceTable":"guc","SourceKey":"event_source","SourceRevision":"wiki-repair-20261023:c9346f5c98b6382ea1cf572dd47281e61a74f1c83c8de89d33ef5f83b1df54f8","Facts":{"boot_val":"PostgreSQL","category":"Reporting and Logging / Where to Log","context":"postmaster","description":"When logging to event log is enabled, this parameter determines the program name used to identify PostgreSQL messages in the log. 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