Improve UD logging.

SignalServiceKit/src/Messages/OWSMessageSend.swift

@@ -83,13 +83,13 @@ public class OWSMessageSend: NSObject {
 
     @objc
     public func disableUD() {
-        Logger.verbose("")
+        Logger.verbose("\(recipient.recipientId)")
         udAccessKey = nil
     }
 
     @objc
     public func setHasUDAuthFailed() {
-        Logger.verbose("")
+        Logger.verbose("\(recipient.recipientId)")
         // We "fail over" to non-UD sends after auth errors sending via UD.
         disableUD()
     }

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -1139,7 +1139,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 
     SignalRecipient *recipient = messageSend.recipient;
 
-    OWSLogInfo(@"Message send succeeded.");
+    OWSLogInfo(@"Message send succeeded (wasSentByUD: %d).", wasSentByUD);
 
     if (messageSend.isLocalNumber && deviceMessages.count == 0) {
         OWSLogInfo(@"Sent a message with no device messages; clearing 'mayHaveLinkedDevices'.");