additional information in debug messages

instance.go

@@ -63,7 +63,7 @@ func newInstance(member *discordgo.Member) *chatInstance {
 func setupInstance(member *discordgo.Member) *chatInstance {
 	channelID := guildMap[member.GuildID]
 	if channelID == "" {
-		log.Debug("Instance setup skipped on empty channel ID.")
+		log.Debugf("Instance setup skipped on empty channel ID for guild %s member %s.", member.GuildID, member.User.ID)
 		return nil
 	}