I had no indication of this problem until I stopped for gas during a trip from TX to CO. I was somewhere in NM. I pulled up to the pump, the pressure dropped, and the alarm started. I checked everything. No leaks, knocks, etc. I finished my trip to CO. I had a new oil pump put in with new o-rings and pick up tube. I also put 2 quarts of Lucas oil stabilizer in, but that did not help. Once the truck gets to operating temp, pressure drops to about 4psi at idle, which sets off alarm. Running I had about 20psi. Punch it, and it would go to about 35psi. If you could keep the idle at around 750, pressure would stay high enough to keep alarm off.
So to answer your question, there were no indications of a problem before or during. I drove it 1100 miles home from CO like that and had no other issues. If your problem is a spun cam bearing, like mine, I would get it fixed. It only gets worse over time. I would hate to imagine what the next step would be in that line of failure.