It was added inside the 'icinga' check task, but not for the REST API.
Thanks for asking, @Thomas-Gelf
status->Set("active_service_checks_15min", GetActiveServiceChecksStatistics(60 * 15));
status->Set("passive_service_checks_15min", GetPassiveServiceChecksStatistics(60 * 15));
+ // Checker related stats
status->Set("remote_check_queue", ClusterEvents::GetCheckRequestQueueSize());
+ status->Set("current_concurrent_checks", Checkable::GetPendingChecks());
CheckableCheckStatistics scs = CalculateServiceCheckStats();