That database however has lost redundancy and is really no different than if you had lost a hard drive in a RAID. How this information is reflected in the UI is for a multitude of reasons. The most important being that if the secondary Exchange server was "Down", AppInsight for Exchange on that node would go into an "Unreachable" state based on implicit dependencies. That means you would not receive errors from that application because the node is down and all children of that parent have been changed to "unreachable" status to prevent alert storms. With that said there has to be some way of alerting users to the fact that redundancy has been lost.
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