How do you detect motor failure electronically? (how much, AC, light)

[buenos]

I have a sump pump (AC motor) that I cannot physically access every day.
I need to monitor it's health. The only thing I can do is to monitor when it runs (logs) and how much current it draws, over wifi from a smart outlet.
It normally runs for a few minutes and draws 8A current.
Will a failed AC motor consume more current or less current than nominal?
Will the current consumption change a few months before failure, or only at the moment of the fatal failure?
Does the current load change with temperature (weather)?

[harry chickpea]

Your reasoning doesn't go far enough. A pump motor can be perfectly fine, but the inlet or outlet clogged resulting in a flood.

Instead of monitoring the motor, you need to monitor the level of water in the sump. A float switch typically is the answer. If you don't want to hook it to a light or alarm, use a 100 watt lamp as a load and plug that circuit into your smart switch. When it sees the extra load, it can warn you.