Remember, Bayern Munich is impatient and wants to end the competition immediately, because in the Bundesliga they have nothing left to fight for. Arteta needs to save energy to fight Bayern Munich. Based on today Line Up, Arsenal is still with the same squad formation by backing up Martinelli, Trossard and Tomiyasu.
Munich may not be very good in the domestic league at the moment but they are full of surprises in the UCL and always play their best to qualify for the next round. Arsenal will clearly be careful when facing Munich in the first leg, no matter if they play at Arsenal's home, Munich will definitely finish them off. Every opponent, that's what Arteta has to be wary of because Munich could play with higher tension in the UCL than in the domestic league because they have failed to win the title in the Bundesliga this season and only have one more chance, namely to win the title in the UCL.
If Arsenal plays defensively like they faced Manchester City in the past, I think that is the wrong thing because Munich will of course take the opportunity and opportunity to score a goal when they find a gap. I think Arsenal must of course play more bravely and be open to score lots of goals so they can it will be safer in the second leg, obviously this is a very tough job, especially today against Brighton, of course Arteta is taking care of every important player so they don't get injured to face Munich in the next few days. Stamina must be maintained to be able to play the best game and get the best results.