Logs are an essential part of debugging operational issues, improving user experience, and securing our Drupal sites, yet they are often overlooked. In this session I will review a number of tools that will help ensure our logs are utilized to the fullest extent possible including Graylog2 (and the GELF format), Logstash, Kibana, rsyslogd, syslog-ng, and the Drupal core logging system. Lastly, I will talk about how the Drupal.org infrastructure team built a centralized logging system with syslog-ng, Logstash, and Kibana to help debug problems as they arise.