docs: protected void insertPrincipalIdAsAttributeIfNeeded(final Principal principal, final Map<String, List<Object>> attributesToRelease,
                                                          final Service service, final RegisteredService registeredService) {
          if (StringUtils.isNotBlank(getPrincipalIdAttribute())) {
              LOGGER.debug("Attempting to resolve the principal id for service [{}]", registeredService.getServiceId());
              val id = registeredService.getUsernameAttributeProvider().resolveUsername(principal, service, registeredService);
              LOGGER.debug("Releasing resolved principal id [{}] as attribute [{}]", id, getPrincipalIdAttribute());
              attributesToRelease.put(getPrincipalIdAttribute(), CollectionUtils.wrapList(principal.getId()));
          }
      }