Comment by lyokha

Yes, more than 5 years in a few components (mostly as smart reverse proxies as I said in another comment). They are high-loaded entry points on the client front, with a few hundred thousands clients. But I cannot say details due to NDA, even where it's used.

I did not compare performance with other alternatives such as OpenResty. I tried, but Nginx is very immune to resist loading it well from home network :)