code: public SummarizeResultsInner summarizeForResourceGroupLevelPolicyAssignment(String subscriptionId, String resourceGroupName, String policyAssignmentName) {
          return summarizeForResourceGroupLevelPolicyAssignmentWithServiceResponseAsync(subscriptionId, resourceGroupName, policyAssignmentName).toBlocking().single().body();
      }
docs: Summarizes policy states for the resource group level policy assignment.
  
  @param subscriptionId Microsoft Azure subscription ID.
  @param resourceGroupName Resource group name.
  @param policyAssignmentName Policy assignment name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws QueryFailureException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the SummarizeResultsInner object if successful.