In most clustered systems, you need at least 3 observers, so that its a clear majority of systems can decide that the observer is not working as expected. So I

In most clustered systems, you need at least 3 observers, so that its a clear majority of systems can decide that the observer is not working as expected. So I guess 5 security OPS teams in different regions of the world, and they can all call a vote if one of the teams is now 'bad' :)