Like others have mentioned this is a thing even in not exotic embedded systems, and it should be a thing for mobile applications although many tend to neglect t

Like others have mentioned this is a thing even in not exotic embedded systems, and it should be a thing for mobile applications although many tend to neglect this aspect as you can clearly see in bad app reviews. At some point of my career I actually measured milliAmps and synced it to an app waking up times using an oscilloscope, this was the core for the OS of a mobile phone.