| ClassHasNoFields | Diagnostic, if class has no fields. | 
| DefragmentRecommendation | Diagnostic to recommend Defragment when needed. | 
| DefragmentRecommendation.DefragmentRecommendationReason |  | 
| DeletionFailed | Diagnostic on failed delete. | 
| DescendIntoTranslator | Query tries to descend into a field of a class that is configured to be translated
 (and thus cannot be descended into). | 
| DiagnosticBase | base class for Diagnostic messages | 
| DiagnosticToConsole | prints Diagnostic messsages to the Console. | 
| LoadedFromClassIndex | Diagnostic, if query was required to load candidate set from class index. | 
| MissingClass | Diagnostic if class not found | 
| NativeQueryNotOptimized | Diagnostic, if Native Query can not be run optimized. | 
| NativeQueryOptimizerNotLoaded |  | 
| ObjectFieldDoesNotExist |  | 
| UpdateDepthGreaterOne | Diagnostic, if update depth greater than 1. |