Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for mysql.ccvcvudsj.service.one failed: Name or service not known in /customers/c/d/3/ccvcvudsj/webroots/r499736/config.php on line 10

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql.ccvcvudsj.service.one failed: Name or service not known in /customers/c/d/3/ccvcvudsj/webroots/r499736/config.php:10
Stack trace:
#0 /customers/c/d/3/ccvcvudsj/webroots/r499736/config.php(10): mysqli_connect('localhost', 'root', 'KpM0uRJ3YgrT', 'demo')
#1 /customers/c/d/3/ccvcvudsj/webroots/r499736/index.php(12): require_once('/customers/c/d/...')
#2 {main}
  thrown in /customers/c/d/3/ccvcvudsj/webroots/r499736/config.php on line 10