I mistakenly created a website domain name www and of course I deleted at once, which at first, I thought I was creating a database which will add prefix username_www (my mind was a little bit twisted doing 6 website domain at once)
And duh, file /etc/php//fpm/pool.d/www.conf got deleted. Since this pool is used for phpmyadmin and webmail, I could not open it. I was quite confused for sometimes tho
Please consider to rename www.conf to an unique name or whatever to secure it, so it is a bit bullet proof.
I think www.conf is already a unique name and is the ususal standard config name for php fpm - i dont see any reason to rename that to something else - just dont delete conf files where you dont know what they are there for ;).