The "OGG capture client successfully detached from GoldenGate capture" message indicates a clean, planned disconnection between the Oracle GoldenGate Extract process and the source database. It is a standard status notification typically caused by a manual stop command or a routine configuration change [1].
: The database was closed or restarted, forcing the capture process to disconnect. Do not alert on the message itself
Do not alert on the message itself. Instead, alert on: Only when it is accompanied by an "Abended"
The message is a confirmation of a clean break between GoldenGate and the Oracle Database. In the vast majority of cases, it is a healthy part of the process lifecycle. Only when it is accompanied by an "Abended" status should you dive into the report files and database logs to investigate further. forcing the capture process to disconnect.
Example of a bad sequence: