f add additional trace-level logging for chan_update generation

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -1598,6 +1598,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 				action: msgs::ErrorAction::IgnoreError
 			});
 		}
+		log_trace!(self.logger, "Attempting to generate broadcast channel update for channel {}", log_bytes!(chan.channel_id()));
 		self.get_channel_update_for_unicast(chan)
 	}
 
@@ -1607,6 +1608,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 	/// provided evidence that they know about the existence of the channel.
 	/// May be called with channel_state already locked!
 	fn get_channel_update_for_unicast(&self, chan: &Channel<Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
+		log_trace!(self.logger, "Attempting to generate channel update for channel {}", log_bytes!(chan.channel_id()));
 		let short_channel_id = match chan.get_short_channel_id() {
 			None => return Err(LightningError{err: "Channel not yet established".to_owned(), action: msgs::ErrorAction::IgnoreError}),
 			Some(id) => id,