In our projects a simple addiition i found to be very useful to debug the process flow on production environment was to override the getExecutionListener method on our SpringBootProcessApplication class.
This way you have a method notify being called everytime your token moves and put a log.
If your log include businesskey, eventName (start, end, take), process definition and current activity id, i think you’ll be fine on this debug. Maybe you’ll want to filter the “take” events and log only start and end of each activity.