AEM_How to monitor Replication agents

You can monitor your replication queues to detect when a queue is either down or blocked

• all enabled queues should have the status idle or active, which indicate normal operation; 
• No queues should be blocked, which is often a sign of problems on the receivers side.
• if the size of the queue grows over time this can indicate a blocked queue.

To monitor a replication agent:

a. Access the Tools tab in AEM.
B. Click Replication.
C. Double-click the link to agents for the appropriate environment (either the left or the right pane); for example Agents on author.
The resulting window shows an overview of all your replication agents for the author environment, including their target and status.

Here you can:
• See whether the agent is enabled.
• See the target of any replications.
• See whether the replication queue is currently active (enabled).
• See whether there are any items in the queue.
• Refresh or Clear to update the display of queue entries; this helps you see items enter and leave the queue.
• View Log to access the log of any actions by the replication agent.
• Test Connection to the target instance.
• Force Retry on any queue items if required.

Caution:

Do not use the "Test Connection" link for the Reverse Replication Outbox on a publish instance.

If a replication test is performed for an Outbox queue, any items that are older than the test replication will be re-processed with every reverse replication.

If such items already exist in a queue, they can be found with the following XPath JCR query and should be removed.

/jcr:root/var/replication/outbox//*[@cq:repActionType='TEST']