They'll disappear automatically when you stop sending data about them (within a few hours) - we've done that for our customers who have elastic / rolling servers on AWS for ex.

If that doesn't cut if for you, we're happy to help - let us know what you're trying to do!

That's kind of cool :) But what about the case where I have an important server that's down for a few hours. Do I lose all the data previously collected?

Nope - all the data stays there, and can be shown on dashboards. We just don't show the hosts that don't submit data in the host lists, and don't count them towards the total number of hosts charged for. Does that answer your question?

Great! Thanks. Look forward to finding a chance to check this out some more.