What does the second idle instances setting do?

[pdknsk]

I've noticed idle instances got another slider. It seems like min idle
instances, but the docs says it's not possible to set min idle.

http://code.google.com/appengine/docs/adminconsole/performancesettings.html#Setting_the_Number_of_Idle_Instances

[Gregory D'alesandre]

The documentation hasn't been updated yet (it will be later on today) but the min idle instances setting allows you to determine how many instances you want to keep running constantly to ensure you don't have slow startup times.  This is the equivalent of the old Always-On.  In general 1 min idle instance should be fine.

Greg

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[andrew]

can we get a "zero" option for min idle instances and just pay for
demand scheduled use, if we want to live with the start-up time.

[Gerald Tan]

Setting min idle instance to "automatic" should do that.