A max-instances setting would, as you say, let you spread your "capacity 
exceeded" failures to some proportion of requests made during the busiest 
periods rather than to all requests at some time period at the end of the 
day/week/month, but it would also risk failing to serve some requests which, 
with hindsight, could have been served without exceeding the overall quota 
(ie a short busy burst followed by a long period of normal traffic).

That pattern is effectively what normal hosting achieves, whereas GAE is 
expressly designed to be able to, out of the box, not fall over in that way, 
so while I see your point in requesting such a control facility, I can see 
why it wasn't provided up front and why it might not be seen as a high 
priority by the builders and many of the users of GAE.

--
T

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