I'm seeing on our firewalls that our test CHR is trying to connect to IP 169.254.169.254 with HTTP every few seconds (= over 250.000 connections attempts in 12h) . Google showed some old posts from 2015 where it was described as bug that will be fixed. As we're running 6.41.4, so it seems not.
I did following to not mess our firewall logs up:
/ip route add distance=1 dst-address=169.254.0.0/16 type=blackhole