connect() to unix:/run/php-fpm/www.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: 1 - Yegor Shytikov - Medium
Exporter do not work from docker container with host socket · Issue #43 · hipages/php-fpm_exporter · GitHub
How to Connect NGINX to PHP-FPM Using UNIX or TCP/IP Socket
php-fpm.sock failed (13 permission denied) - Fix it now
How to Fix php5-fpm.sock failed (13: Permission denied) error