Fatal error: Uncaught exception 'RuntimeException' with message 'Failed to create socket-client for udp://logstash:12201i: php_network_getaddresses: getaddrinfo failed: Name or service not known (0)' in /app/vendor/graylog2/gelf-php/src/Gelf/Transport/StreamSocketClient.php:99 Stack trace: #0 /app/vendor/graylog2/gelf-php/src/Gelf/Transport/StreamSocketClient.php(131): Gelf\Transport\StreamSocketClient::initSocket('udp', 'logstash', 12201, Array) #1 /app/vendor/graylog2/gelf-php/src/Gelf/Transport/StreamSocketClient.php(149): Gelf\Transport\StreamSocketClient->getSocket() #2 /app/vendor/graylog2/gelf-php/src/Gelf/Transport/UdpTransport.php(92): Gelf\Transport\StreamSocketClient->write('x\x9C\xEDT\xDFo\xDA0\x10\xFEW"?\xB5\x12...') #3 /app/vendor/graylog2/gelf-php/src/Gelf/Publisher.php(75): Gelf\Transport\UdpTransport->send(Object(Gelf\Message)) #4 /app/vendor/monolog/monolog/src/Monolog/Handler/GelfHandler.php(62): Gelf\Publisher->publish(Object(Gelf\Message)) #5 /app/vendor/monolog/monolog/src/Monolog/Handler/AbstractPro in /app/vendor/graylog2/gelf-php/src/Gelf/Transport/StreamSocketClient.php on line 99