[Hawkular-dev] RfC: Remove / rename servers from / in inventory

Hey, currently we can add (WF) servers to inventory easily, but we can't get rid of them anymore. Similarly it is not really clear what should happen if a serve changes its name. In WildFly 10 supposedly a new uuid kind of thing should appear, that would identify each WF uniquely and which could serve as the "primary key", so that the name is just a display attribute that can be changed at will, so that the renaming piece is sort of solved. Now to the semantics of "uninventory" (not deletion of physical servers). In RHQ we had uninventory that removed the server from inventory. After a discovery scan happened, it showed up again and could be re-inventoried. During uninventory, all collected metrics etc. and alert definitions for the resource were wiped (or prepared for wiping). This (wiping of recorded metrics) has more than one time been mentioned as undesired e.g. in case that the uninventory happened due to bad luck. Also in RHQ there were issues when e.g. the machine where a WF-server was running on got renamed. Some questions that come to mind: - Should we wipe data when a server gets uninventoried? - How can we prevent it from entering inventory directly after an uninventory again? - what states do we need (data wiping may take too long to be done synchronously)? - would users perhaps want a data dump to external storage before wiping? - How can we make sure that servers without that uuid can still be identified even after rename (of the machine)? - How can we make sure that servers without that uuid can still be identified even when they are moved to a different pod Heiko