code: protected Collection<ConfiguredIssueService> getConfiguredIssueServices(IssueServiceConfiguration issueServiceConfiguration) {
          CombinedIssueServiceConfiguration combinedIssueServiceConfiguration = (CombinedIssueServiceConfiguration) issueServiceConfiguration;
          return combinedIssueServiceConfiguration.getIssueServiceConfigurationIdentifiers().stream()
                  .map(issueServiceRegistry::getConfiguredIssueService)
                  .collect(Collectors.toList());
      }
docs: Gets the list of attached configured issue services.
  
  @param issueServiceConfiguration Configuration of the combined issue service
  @return List of associated configured issue services