I have a Java SubscriberActor with a log message in
onLiveProcessingStart() callback. I see in my logs that it gets called
not just on startup, but while the app is running, and without any
callbacks to onError or similar in between.
What are the conditions for having an already live subscriber switch
back to reading phase, and then to live again, causing
onLiveProcessingStart() to be invoked multiple times during the app