About the Cluster Task History Tab
This tab shows a history of channel operations and other tasks that have dispatched to one or more servers in the cluster. On this page you can monitor the status of recently dispatched tasks. For example, when you deploy a group of channels, a new entry appears on the list that shows the status/duration of the deploy operation across the cluster. Clicking the + next to a channel task expands the operation so you can see an entry for each server and the task's status/duration. Expanding a server another level reveals the status/duration of each deploying channel on that particular server.
You can use the Cluster Task History tab as a diagnostic tool for Syncing problems that occur when a channel operation fails to execute on one or more servers in the cluster. Double-click any tasks with Error status to view the full error details: