Logging-on-Rails 5: hide and seek with formatting, readibility and parsing

Photography skill \o/

Currently under Rails 5.2.1 / Ruby 2.5.1 and I quickly had enough of System.out.prin… oops, enough of puts. Anyway. I just want to track what happens in my application: how many milliseconds is taken by this method? Was this called before that? What happened before this error? And such.

To get the info, logging is our messiah. Hallelujah…or not.

As starters, here are some global Rails-independent concepts related to logging:

• Log appenders: https://blog.scalyr.com/2018/01/log-appender/
• Log aggregation: https://stackify.com/log-aggregation-101/
• Structured logging: explanation from DZone or Stackify. I also recommended articles from Jessica Suttles: Part 1, Part 2 and Part 3
• From my Java experience, I am used to Logger Hierarchy: http://tutorials.jenkov.com/java-logging/logger-hierarchy.html

Summary

1. Ruby default logger
   1.1 Default configuration is verbose and overwhelming
   1.2 Fine tuning configuration
   1.3 Summary 1
   1.4 Going further: custom log formatting
   1.5 Custom console formatting
   1.6 Summary 2
2. Log4r
3. Logging
   3.1 Summary
4. Lograge
   4.1 Simple configuration with…