are idle instances billed in a diferent way?

[Alejo gomez]

I have the doubt if the idles instances in app engine are billed in a different way, or as such they are not billed.

My doubt comes from the following. Observing in stackdriver the behavior of my instances, I see the following:

You can see that all day I've had an idle instance. But when I enter the app engine dashboard I see this:

Then  why only bill me 4.18 hours of instance, if all day I've had an idle instance? 

thanks for the help

[Elliott (Cloud Platform Support)]

Hello Alejo,

Please use the Platform Billing Support form to contact our billing support team as they do not process issues from Google Groups.