NGINX Plus: Server Slow-Start

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Part of Upstream Settings

The server slow‑start feature prevents a recently recovered server from being overwhelmed by connections, which may time out and cause the server to be marked as failed again.

In NGINX Plus, slow‑start allows an upstream server to gradually recover its weight from 0 to its nominal value after it has been recovered or became available. This can be done with the slow_start parameter to the server directive.