How to tell nginx to check dead backend in upstream adaptively?

[Ryan Chan]

Hi,

Currently nginx will check every fail_timeout (default=10s) which is too
frequent when the backend server dead completely that require manually
replacement and it might take long time.

Definitely we can mark it as down in the config, but that is not an
automatic solution.

Is it possible to config nginx that it check adaptively?
e.g. start from 10s, then 20s, 40s, 60s etc?

Or are there any better approach?

Thanks.
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