It would be ideal for a custom dashboard to have an Agent Version Usage widget where it displays all agent versions. This way it will help keep track of which assets are in newer, up-to-date versions and which assets are older. This will help investigate to get those older agent versions upgraded to the most recent agent version.
Example:
Agent version 25.17.2584 --> 17
Agent version 25.25.2685 --> 12
Agent version xx.xx.xxxx --> xx