it looks like it is because the collectd-libpodstats plugin sends data with that domain name. Even though that data is not shown on the Grafana dashboard. I have 3 controllers,2 compute and ceph node. in the Grafana dashboard I see each node twice with different name e.g. controller-0 and controller-0.redhat.local Only one of them (x.redhat.local) shows data. If I select the second one no data appear. It should be only one instance of each overcloud node in the list.
May want this in 16.1 once it's complete
fixed
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform 16.1.7 (Train) bug fix and enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:3762