+ /// When we get an update_persisted_channel call with no ChannelMonitorUpdate, we insert the
+ /// MonitorUpdateId here.
+ pub chain_sync_monitor_persistences: Mutex<HashMap<OutPoint, HashSet<MonitorUpdateId>>>,
+ /// When we get an update_persisted_channel call *with* a ChannelMonitorUpdate, we insert the
+ /// MonitorUpdateId here.
+ pub offchain_monitor_updates: Mutex<HashMap<OutPoint, HashSet<MonitorUpdateId>>>,