Merge pull request #263 from egguy/master

Add __qualname__ property to allow migration without problems

Author: asherf

django_prometheus/models.py

@@ -50,4 +50,5 @@ def delete(self, *args, **kwargs):
             model_deletes.labels(model_name).inc()
             return super().delete(*args, **kwargs)
 
+    Mixin.__qualname__ = f"ExportModelOperationsMixin('{model_name}')"
     return Mixin