Some availability replicas are disconnected
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
This policy rolls up the connection state of all availability replicas and checks for any availability replicas that are DISCONENCTED. The policy is in an unhealthy state when any availability replica is DISCONNECTED. The policy is otherwise in a healthy state.
For this release of SQL Server 2016, information about possible causes and solutions is located at Some availability replicas are disconnected on the TechNet Wiki.