Handle multiline log event (stack traces)

[bric3]

Currently the code is only able to process single line log messages. However it's possible to have multiline log messages.

Scope

In particular this ticket is about handling stacktraces, which usually starts with with whitespaces. I am not familiar with stacktraces in other languages, so the goal of this ticket is to focus on Java stack traces that may appear in a log trail.

Out of scope

• Multi line log messages not starting by a whitespace
• Stacktraces of other than Java

[bric3]

This could be implemented as a normalizing step that can understand stacktrace and adds it as a metadata / placeholder.