We perceive this to be an ongoing threat that will be there for many years to come.

They respond very aggressively when they perceive a threat that could be meaningful,

The market is reacting to ongoing concerns of a threat to oust the president.

I truly believe anybody's a threat,

It's an ongoing mess of junk, overgrown and unkempt.

Unless you let someone know what action has been taken, the customer is never going to perceive a difference. You've got to close the loop. If the customer isn't aware of the fix, then the remedy doesn't exist.