I changed my autoscaling settings to be much more aggressive, below, and 
steady state instance count is back down to more or less where it was 
before. I'm stil very curious what changed on App Engine's end, but I'm at 
least out of the woods for now.

automatic_scaling:
 max_idle_instances: 1
 target_cpu_utilization: .9
 min_pending_latency: 500ms
 max_concurrent_requests: 30 

On Monday, June 28, 2021 at 10:27:13 AM UTC-7 Ryan B wrote:

> Hi all! The steady state instance count for a couple of my apps (on Python 
> 3 Standard) increased recently, over the last week or two, without any 
> obvious code or architecture or traffic or load or change on my end. Did 
> the App Engine scheduler itself change recently?
>
> Here's the active instance count for one app. I haven't deployed a new 
> version since April, and load (etc) haven't meaningfully changed either.
>
> [image: 123658491-a116ad80-d7e6-11eb-8805-9ef33584cff7.png]
>
> Here's another. I deploy this one more often, multiple times a week, but 
> nothing related to utilization recently that I can think of, and there 
> haven't been any other architectural, app config, or load for months.
>
> [image: 123658263-657be380-d7e6-11eb-89b4-a8e334e0c5f8.png]
>
> Here are the app.yaml files; neither has changed since March, when I 
> upgraded both apps to Python 3.9.
> https://github.com/snarfed/bridgy-fed/blob/main/app.yaml
> https://github.com/snarfed/bridgy/blob/main/app.yaml
>
> If the scheduler did change, any chance anyone knows how to configure it 
> to get my steady state instance counts back to where they were before?
>
> Thanks in advance!
>

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