PartitionPaused
class PartitionPaused @InternalWowApi constructor(val group: String, val subscription: String, val partition: Int, val reason: String) : ObservedEvent
subscription of the subscription group paused partition on a systemic failure, reason describing it (the failure's own words, so text): it handles nothing there but one probe at a time, spending no aggregate's retries and parking none, until a handling succeeds (PartitionResumed).