Why GAE launched the second instance with Max Idle Instances set to 1

I am using Google Ap Engine with billing status enabled.
Idle Instances: (1 - 1)

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And with only two clients on my service, sometimes I saw a second instance. The problem is that it takes 15 seconds to start a new instance (spring and co ..).

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80Mb of memory should be on the same level?
Input for a new instance: / _ ah / warmup 200 14580ms 0kb The
second instance disappears after a few seconds.

Why with 3-4 queries does GAE run the second instance? The first does nothing (almost)!

I tried changing the "Pending Delay" without success.

Decision?:)

thank

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