hi all, is it possible to run a query from the fleet gui that allows changing the server hostname on the endpoints? basically I need to migrate all endpoints to a new fleet server with new FQDN

Not that I am aware of. You'd have to redeploy the agent and/or use a CNAME or something like that.

@Jason is right. You'd need to either generate new installer packages and enroll your hosts in the new instance, set up a redirect to the new server (which could be tricky), or modify the existing osquery flags on the host with the new server's information. At this point, it isn't something that can be done through Fleet.