It should be possible to view a cache's availability via the Console. It should also be possible for the user to manually set the availability to AVAILABLE or DEGRADED when:

<partition-handling when-split="ALLOW_READS | DENY_READ_WRITES"/>

Create a cache in the console

{
  "distributed-cache": {
    "mode": "SYNC",
    "statistics": true,
    "encoding": {
      "key": {
        "media-type": "application/x-protostream"
      },
      "value": {
        "media-type": "application/x-protostream"
      }
    },
    "partition-handling": {
      "when-split": "DENY_READ_WRITES",
      "merge-policy": "NONE"
    }
  }
}

From the list of caches, if the health is degraded, an additional action should exist to "set available" (final label would be seen with Don). A confirmation action will be asked.
The detail of the cache when the cache is degraded, should not display the entries error. (double checking this part still)