The phone is not in sleep or standby mode when there is an app running in the foreground and the screen is on.
With all radios, mobile data, WiFi, GPS (assisted, high accuracy), NFC, Bluetooth etc on, logged in to the default Google apps and services, with three mail accounts configured, with enhanced 4G (VoLTE) set as preferred network at Telenor DK, my Nokia 8 use around 1% battery per hour when the screen is off, both at home and also when driving around the country with Google maps recording where I've been.
~100 hours standby time on one recharge works for me.
How is your phone doing, practically, and what do you hope to achieve?
I am more than happy with the battery life on my Nokia 8 but standby times when the phone goes in to deep sleep are clearly nowhere near as good as they were on 7.1.1.
8 hours overnight the phone would lose between 0 and 2%, now it loses 8 or 9%. No exactly earth shattering but significant enough to be noticeable.
I kept an eye on the overnight battery drain last week.
During 8 hours in Do Not Disturb mode my Nokia 8 lose 2-4% power.
There is no social apps installed, but it is logged in to everything Google, both mobile data and WiFi, location services, NFC etc. is on.
My Nokia 8 insisted to update to Oreo when it was switched on for the first time, so I can't comment on any difference.
Please consider the battery indicator measures the voltage, not the actual remaining capacity. It may seem to lose power faster when close to 100% than at around 50%. It varies for chemical reasons, and as the battery wear down.
I'm unable to find reliable, official information regarding the 'interactive governor' from the original post, only unofficial guesswork from questionable sources.