[underwater]

The machine gave two big hints. The fan spinning up indicated the computer was needlessly busy. Then the Activity Monitor revealed the problem was the "core brightness" system. From there it is a small leap to make the connection to Night Shift.

On mobile devices the only indications we have that something is wrong is warm devices and lower battery lives, which are far less immediate. And we don't have the detailed CPU usage that desktop devices provide. Maybe we need a simulated fan sound when our devices are being pushed too hard.

[tialaramex]

This Android phone tells me proactively if it notices an application using lots of battery life or network bandwidth. And if I'm inquisitive it will let me see how much they used anyway when it didn't alert.

For example apparently Chrome used 3% of the battery life so far today whereas a game I was just playing already consumed 5%

[Symbiote]

On Android you used to be able to open a terminal and run "top".

With the improved security model, that now only shows the bash and top processes.

[astrange]

You can get much more useful info out of Activity Monitor by running spindump.

For iOS the Battery settings are usually good at telling you about power drain.

[saagarjha]

I don't think the Battery settings shows you power usage by system daemons?

[jedieaston]

It’s not specific, but it’ll say “System Services” I believe.