message: Fix limit and currentValue properties
  Types need to be long since they can have 64-bit values.
diff: },
  "limit": {
  "type": "integer",
  + "format": "int64",
  "readOnly": true,
  "description": "Maximum value for this metric"
  },
  "currentValue": {
  "type": "integer",
  + "format": "int64",
  "readOnly": true,
  "description": "Current value for this metric"
  }
  