Some of the indicators I've seen repeating are:

I had less and less to do. me, or the team, or the team next to us.. when people would go from 'busy' to 'got nothing to do 4h per day for the past month'.

I also noticed that companies start to cut down on seemingly unnoticeable stuff, (laugh if you want) quality of choices of coffee go down, quality of hand soap, toilet paper, napkins is degraded/replaced, ordering notepads takes 1 more signature and 2 more weeks, and other small pet peeves that suddenly appear.