Add a TEMPORARY_DEGRADED condition

csi.proto

@@ -1332,19 +1332,23 @@ message VolumeHealth {
     UNKNOWN = 0;
     // Volume is accessible and no problems are detected. 
     HEALTHY = 1;
-    // Volume has degrading performance or is not accessible currently,
-    // but there's no reason to expect data loss. Examples: power
-    // outage, network outage, maintenance.
-    TEMPORARY_UNHEALTHY = 2;
+    // Volume is not accessible currently, but there's no reason to
+    // expect data loss. Examples: power outage, network outage,
+    // maintenance.
+    TEMPORARY_INACCESSIBLE = 2;
+    // Volume is accessible currently, but is degraded. Data loss
+    // is unlikely as the storage system is fixing the problem
+    // automatically.
+    TEMPORARY_DEGRADED = 3;
     // Volume is accessible currently, but a problem is detected that
     // could lead to eventual data loss. Examples: recoverable hardware
     // failure, cooling failure, equipment significantly past end of
     // life.
-    FATAL_IMMINENT = 3;
+    FATAL_IMMINENT = 4;
     // Volume is not accessible currently, and there is reason to
     // believe the outage may be permanent. Examples: unrecoverable
     // hardware failure, natural disasters, damage to equipment.
-    FATAL = 4;
+    FATAL = 5;
   }
 
   // The level of the health condition of the volume.