We have a new Icinga server, icinga1001.wikimedia.org (184.108.40.206, 2620:0:861:3:208:80:154:84) which will be replacing
einsteinium.wikimedia.org (220.127.116.11, 2620:0:861:4:208:80:155:119) in the future.
FRACK servers are sending passive check results with send_nsca to NSCA on the Icinga server.
Can we add icinga1001 here in parallel and send to both IP for a migration period?
Also, separately, einsteinium probably appears somewhere in pfw firewall rules and here it's the same question, could we please allow the new IP before removing the old IP and have both in there for a little while until the old server is actually retired?