Maybe my question sounds silly but I really want to know about this. I believe the HA for icinga2 IDO is already possible. So, setting two masters in the master zone doesn't matter for recording to IDO database I believe. What about graphite and gelf? If I enable graphite and gelf on both nodes in the master zone, will it record only one time (which means they are aware of the cluster) or both nodes record the same data? Cheers.