[Epic] Logger

we need some solution to view the nodejs-log and somehow structure it.
What i mean is:
1. the developer/maintainer should be able to view logs for production
2. the logs need to be filterable (show only criticals, etc)
3. having a standard structure (severity, stack, message, scope/module etc.)
4. a solution that is good for production and development

most of the loggers going for a json format and options for multiple "backends", like file, mongoDB, stdout/err.

First we should identify what options we have on production -> maybe something like greylog...
Beware: sensitive data should not be logged (emails etc.), but don't know how we should handle it right now.