Removed "repeated" from VolumeHealth field

Author: xing-yang

csi.proto

@@ -839,7 +839,7 @@ message ListVolumesResponse {
     // This field MUST be specified if the
     // LIST_VOLUMES_VOLUME_HEALTH controller capability is supported.
     // This field is OPTIONAL.
-    repeated VolumeHealth volume_health = 2 [(alpha_field) = true];
+    VolumeHealth volume_health = 2 [(alpha_field) = true];
   }
 
   message Entry {
@@ -877,7 +877,7 @@ message GetVolumeResponse {
     // volume_health shows error conditions reported by the SP.
     // This field MUST be specified if the
     // VOLUME_HEALTH controller capability is supported.
-    repeated VolumeHealth volume_health = 1 [(alpha_field) = true];
+    VolumeHealth volume_health = 1 [(alpha_field) = true];
   }
 
   // This field is REQUIRED
@@ -1299,7 +1299,7 @@ message NodeGetVolumeStatsResponse {
   // This field is OPTIONAL.
   repeated VolumeUsage usage = 1;
   // This field is OPTIONAL.
-  repeated VolumeHealth volume_health = 2 [(alpha_field) = true];
+  VolumeHealth volume_health = 2 [(alpha_field) = true];
 }
 
 message VolumeUsage {