Once upon a time, we had a critical web application that did not have application logs enabled in production. We decided to leverage our Apache access logs to gain deeper insights into the application. Much deeper than what you'd expect you can get from Apache logs.
This became so powerful that we still use this approach, even if now the application logs are properly managed as well.
I'll talk about Lightspeed's Logstash infrastructure, but the main ideas in this improvised talk are applicable to any modern logging infrastructure.
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