You probably want to get rid of them as soon as possible, they're big pests and you don't want them spraying that rancid almond smell all over your beautiful buds.
find the area they are most common in the garden and use sticky traps. I may be wrong but I don't think they fly so look for cracks or gaps closer to the floor. Always a good idea to put a screen over your air intake as well.
Thats some kind of stink bug beatle. I dont think they harm plants though, not sure. pyrethrin spray like fox farm "dont bug me" might work with minimal effect on your plants, organic breaks back down but is a poison! made from Crysanthemum Bulbs. Where are you?