message: Add UserMetricsModel to exception list for missing readOnly attribute.
diff: @@ -51,6 +51,10 @@ directive:
  reason: This will cause breaking changes in .NET SDK
  from: trafficmanager.json
  where: $.definitions.Endpoint
  + - suppress: RequiredPropertiesMissingInResourceModel
  + reason: This will cause breaking changes in .NET SDK
  + from: trafficmanager.json
  + where: $.definitions.UserMetricsModel
  ```
  ### Tag: package-2018-04
  