I think this is what I could do. But I'm not sure how to apply a custom Token to a device group (or even at the collector group level) and then reference that Token value in a Dashboard outside of the specific example shown where server names are standardised.
Custom Tokens
In addition to the two default tokens, you can select the “+” icon to add custom tokens.
Unlike default tokens, the “value” for custom tokens is not a lookup field, but rather a text input. As such, the value of your custom tokens can be any string. The primary use case for custom tokens is to facilitate the input of new customer data after cloning a dashboard.
Let’s say the MSP has cloned customer A’s dashboard for use with customer B. And that, on this dashboard, there is a table widget that displays the remaining CPU for one of customer A’s servers. If the MSP used a standardized naming strategy for all their devices (e.g. CustomerName.server), they could simply add a custom token to their dashboard (e.g. ##CustomerName##) and define the value as the name of the customer to which this dashboard is dedicated (in this case, customer A). Then, in the table widget’s devices field, they would use ##CustomerName##.server. Strategically, this means that after the MSP has cloned this dashboard for customer B, all they would have to do to populate customer B’s data is replace the value of ##CustomerName## in the dashboard’s Manage Dashboard dialog box with the name of customer B.