After some digging I found out that we've made some modifications on the 
mobile app, which makes it do several ajax requests rapidly.
The result became somewhat strange.

1. Request1 starts a new instance
2. Request2 also starts a new instance since it takes aprox 20 secs to 
start a new instance, and the instance started in request1 isn't ready yet
3. Request3 also starts a new instance since the instance started in 
request1 isn't ready yet

Suddenly we have 3 instances running, and the response time wasn't improved 
since the startup time of each instance it so slow. 
I guess we can improve the behavior fiddling a bit with max/min-pending and 
min-idle instances settings.

But. As it seems, started instances are shut down very quickly, more 
quickly than they used too.

FYI, it all started last week (and it not just me who noticed these changes)

https://code.google.com/p/googleappengine/issues/detail?id=13551

And it keep on going with different kinds of issues, today pub sub calls 
timed out, memcache was totally down, datastore failures etc.
Very shaky, and it makes me wondering if Google is doing som changes in the 
EU region.












Den fredag 17 februari 2017 kl. 16:49:29 UTC+1 skrev George (Cloud Platform 
Support):
>
> Hello Linus, 
>
> You seem to have 3 projects running at this time. Which one of the 3 is 
> affected by the 100 instances for no reason at all behavior change? For 
> confidentiality, you can send us the project name by private email. 
>
> None of the 3 projects start more than a maximum of 17 instances at a 
> time. When did this change in behavior occur, exactly? 
>
> Looking at your versions in the console, one notices that "automatic" is 
> chosen as value for the "Min Idle Instances" and "Max Idle Instances" 
> parameters.   
>

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