This field reports the application process's current state following its most recent transition, per the description. Because this value updates every time the application changes state, polling it is how monitoring software detects an application going down (transitioning to something like 'stopped' or 'faulted') without waiting on a full module-level reboot alarm to fire. A newState reading of 'faulted' appearing right after a prior oldState of 'active' would justify an immediate alert for that specific application instance rather than the module overall.