Oracle Traffic Director sends notifications to configured HTTP endpoint URL when it detects a change in the origin server status.
The origin server status change event is said to occur when one of the two events occur:
OTD marks the origin server as offline.
OTD marks the origin server back as online from offline.
A notification message is sent when there is a status change of any origin server that is part of the configuration. You cannot receive notifications for a particular origin server of interest while subscribing to the notifications.
Multiple notifications can be sent when there is a change in the status of an origin server that is part of multiple origin server pools or multiple Oracle Traffic Director instances.