We have a set of devices which had the hostname change. The old devices were removed and the new devices were added. However we see in the dashboards the old hostnames are reflecting.
This is only seen in Dashboards and Reports for the interfaces from affected devices.
They show "HostName - ifDescr" as the name for Interface Items.
The ifDescr is correct, but for some the Host Name is the old host name.
Examining the Interface on it's Context Report or other non-Report areas of the Portal UI shows the correct host name.
If we examine the Alias name for the device, which populates it's DisplayName value, we see it still has the old host name.
The mechanism for updating the Alias name and thus the DisplayName, after a devices Host Name changes, fails to function properly.
All supported DX NetOps Performance Management releases r21.2.1 and older.
This is being addressed via defect DE496182. Code change in the r21.2.2 and newer releases resolves this. Upgrade to r21.2.2 or newer to resolve this problem.
The following steps will resolve this until able to upgrade to r21.2.2 or newer releases.
Running the same Dashboards shows the problem is resolved.