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Android 14 seems to have quietly eliminated a trick some apps were using to keep themselves alive when the OS tried to kill them.
As spotted by Greenify developer Oasis Feng, Android now freezes a package's cgroup before killing it. Control groups (cgroups) is a Linux kernel feat...
1: using permissions the user can see and grant/deny
"Allow persistent background usage" or something like that with a tooltip or something that warms the user about resource usage. IIRC, this is already a thing in Android 14.
2: providing visibility into background app usage and history. They do this to some degree, but it's not as good as it could be. Especially when I want to know what is draining my battery when my phone is in my pocket.
It would be good to protect against malware. Bad for apps you legitimately want to run in the background. As usual it seems like a tradeoff between giving the user a choice while not overwhelming uninformed users.
Navigate to the specific app details in settings -> Battery usage -> set to Unrestricted. There, it's off. Just like it was for the past however many years since Doze was first implemented. Or just turn off adaptive battery to disable this for all apps and enjoy your awesome battery life.
This fix is for apps that are set to optimized/restricted and are avoiding being killed.
Does your phone happen to be made by one of the vendors ranking high on this list? If so, that's not on Google (well, you could argue that Google could take more control over Android and force vendors not to do this, but that's another discussion - now we're talking about a fix Google made for apps evading its battery optimizations).
Because I've personally had no problem with apps like AccuBattery and GadgetBridge staying awake when set to unrestricted.