My friend and I were trying to stealth the Ukrainian job and we had it pretty well down. Usually there were two guards in the alley and one in the back rooms.
We killed the two in the alley, bagged and hid the bodies and sneaked into the room with the camera feed. Without fail, the crap hit the fan here. We would wait for the guard to come back into the room, hit him from behind and answer the pager.
While one guy did that, the other one dashed across the back and secured the manager's office. Somewhere in this sequence the alarm would get tripped for "suspicious activity" even though no civilian outside or in the front saw us.
In reading stealth guides for heists, I keep seeing people say to dominate one guard and kill the others.
If you kill all the guards does this trip the alarm?