Source Tracking

Source tracking is enabled with the AddSource configuration option and is useful during development, debugging, and troubleshooting production issues where the exact log origin matters.

Example configuration:

package main

import (
	"log/slog"

	"github.com/netlifeguru/logger"
)

func main() {
	closer, err := logger.Init(logger.Config{
		TerminalOutput: true,
		AddSource:      true,
	})

	if err != nil {
		slog.Error(err.Error())
	}

	defer closer.Close()

	slog.Info("source tracking enabled")
}

Example file output:

{
  "time": "2026-05-11T12:53:20.834553+02:00",
  "level": "INFO",
  "source": {
    "function": "main.main",
    "file": "/examples/test/main.go",
    "line": 20
  },
  "msg": "source tracking enabled"
}

Source tracking helps with:

• locating where a log entry was created
• debugging complex application flows
• tracing errors back to specific files
• improving development visibility

Because source tracking requires runtime caller information, it may add a small amount of overhead and is usually enabled selectively when needed.