Nginx 1.18.0 accept the parameter "http2_push_preload".
Nginx 1.26.1 give "[warn] the "http2_push_preload" directive is obsolete, ignored".
In which Nginx version did this parameter become obsolete?

Nginx 1.18.0 accept the configuration rule "listen 443 ssl http2"
Nginx 1.26.1 give "[warn] the "listen ... http2" directive is deprecated".
In which Nginx version did this configuration rule become deprecated?

I find the answer myself.
In the Nginx verion 1.25.1 the deprecate/obsolete warning was introduced.
https://forum.hestiacp.com/t/nginx-1-25-1-listen-http2-directive-is-deprecated/9816
http://nginx.org/en/docs/http/ngx_http_v2_module.html