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The resident instance does not seem to work

Following my previous question here :

Here is a screenshot of my appengine console to activate billing:

enter image description here

As you can see, I have a resident instance, but all requests are not redirected to it, and instead the dynamic instance is loaded and receives all the traffic. Either I do not correctly understand the concept of residents, or this is ridiculous.

Can someone help me understand what is going on here?

Thanks a lot!

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As far as I know, resident instances refer to the times when there are no other instances (for example, dynamic ones) (busy, no one started). They represent a buffer between full use and new (dynamic) instances. If each dynamic instance is at its limit (or not accessible to anyone), it will take some time to start new instances. At this time, the resident instance receives new requests, so that your service does not become busy for users (and / or reduces the response time of the service). A low-resident instance will cost you the same as heavy use.

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