Share your experience of implementing a logging system from scratch.

When implementing a logging system from scratch, I usually start by choosing a suitable library or tool, such as Log4j, Logback, or the built-in logger in the language. Then I determine which events and logging levels are needed (ERROR, WARN, INFO, DEBUG).

Next, I configure the logging setup — message format, file rotation, output to console or remote server. It's important to think through the log structure to make analysis easier.

After that, I integrate logging into key parts of the application: error handling, important business events, entry and exit points of functions.

Example in Java with Logback:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyApp {
    private static final Logger logger = LoggerFactory.getLogger(MyApp.class);

    public void process() {
        logger.info("Start processing data");
        try {
            // logic
        } catch (Exception e) {
            logger.error("Error during processing", e);
        }
    }
}

Ultimately, the system should provide convenient collection, storage, and analysis of logs for monitoring and debugging.