Excessive logging of traceback for user's errors is removed

Author: ods

graphql/execution/utils.py

@@ -148,11 +148,7 @@ def get_argument_values(self, field_def, field_ast):
         return self.argument_values_cache[k]
 
     def report_error(self, error, traceback=None):
-        # type: (Exception, Optional[TracebackType]) -> None
-        exception = format_exception(
-            type(error), error, getattr(error, "stack", None) or traceback
-        )
-        logger.error("".join(exception))
+        # type: (GraphQLError, Optional[TracebackType]) -> None
         self.errors.append(error)
 
     def get_sub_fields(self, return_type, field_asts):