Logs are written and used for many reasons. For instance, statistical needs, debugging, legal or administrative purposes. The most common ways to create these logs are either syslog, which dumps everything into semi-structured text files - or a custom implementation that does the same thing, only to later apply complex regular expressions and lots of tooling to make sense of it.
And, of course, the log level configured is never right. You either get flooded with details you don't care about or lag the important aspect you were looking for.
Time to rethink your logging strategy!
More information and tickets: https://phpconference.com/munich/