Log each condition that was violated for a stale monitor

There are several conditions that can be violated which indicate a stale
monitor. This logs each that doesn't hold.

Author: waterson

lightning/src/ln/channelmanager.rs

@@ -8637,8 +8637,22 @@ where
 					// But if the channel is behind of the monitor, close the channel:
 					log_error!(args.logger, "A ChannelManager is stale compared to the current ChannelMonitor!");
 					log_error!(args.logger, " The channel will be force-closed and the latest commitment transaction from the ChannelMonitor broadcast.");
-					log_error!(args.logger, " The ChannelMonitor for channel {} is at update_id {} but the ChannelManager is at update_id {}.",
-						&channel.context.channel_id(), monitor.get_latest_update_id(), channel.context.get_latest_monitor_update_id());
+					if channel.context.get_latest_monitor_update_id() < monitor.get_latest_update_id() {
+						log_error!(args.logger, " The ChannelMonitor for channel {} is at update_id {} and the ChannelManager is at update_id {}.",
+							&channel.context.channel_id(), monitor.get_latest_update_id(), channel.context.get_latest_monitor_update_id());
+					}
+					if channel.get_cur_holder_commitment_transaction_number() > monitor.get_cur_holder_commitment_number() {
+						log_error!(args.logger, " The ChannelMonitor for channel {} is at holder commitment number {} and the ChannelManager is at holder commitment {}.",
+							&channel.context.channel_id(), monitor.get_cur_holder_commitment_number(), channel.get_cur_holder_commitment_transaction_number());
+					}
+					if channel.get_revoked_counterparty_commitment_transaction_number() > monitor.get_min_seen_secret() {
+						log_error!(args.logger, " The ChannelMonitor for channel {} is at revoked counterparty transaction number {} but the ChannelManager is at revoked counterparty transaction number {}.",
+							&channel.context.channel_id(), monitor.get_min_seen_secret(), channel.get_revoked_counterparty_commitment_transaction_number());
+					}
+					if channel.get_cur_counterparty_commitment_transaction_number() > monitor.get_cur_counterparty_commitment_number() {
+						log_error!(args.logger, " The ChannelMonitor for channel {} is at counterparty commitment transaction number {} but the ChannelManager is at counterparty commtiment transaction number {}.",
+							&channel.context.channel_id(), monitor.get_cur_counterparty_commitment_number(), channel.get_cur_counterparty_commitment_transaction_number());
+					}
 					let (monitor_update, mut new_failed_htlcs) = channel.context.force_shutdown(true);
 					if let Some((counterparty_node_id, funding_txo, update)) = monitor_update {
 						close_background_events.push(BackgroundEvent::MonitorUpdateRegeneratedOnStartup {