What logging systems have you used in your projects?

In projects, different logging systems were used depending on requirements and environment:

• Log4j / Logback — popular Java libraries for flexible logging configuration with various levels and output to files, console, remote services.
• ELK Stack (Elasticsearch, Logstash, Kibana) — for centralized collection, storage, and visualization of logs.
• Sentry — for real-time error and exception tracking with detailed context.
• Console.log / NSLog — simple logging during development.

The choice of system depends on the project scale, monitoring requirements, and log analysis convenience.