Understanding Modern Log Formats
Learn about structured logging and common formats like JSON. Understand why structured logs are superior for machine parsing and analysis compared to plain text.
What are Application Logs?
Imagine your application as a busy worker. How do you know what it's doing? That's where logs come in!
Logs are like a diary for your software. They record events, operations, and status messages as your application runs. They tell you:
- When something happened
- What action was performed
- If an error occurred
These records are crucial for debugging, monitoring performance, and understanding system behavior.
The Traditional Way: Plain Text
Historically, logs were often simple lines of text. Each event was written as a human-readable string.
For example, a login event might look like this:
2023-10-27 10:30:00 INFO User 'alice' logged in from IP 192.168.1.100This format is straightforward and easy for a human to read when looking at a few lines.
All lessons in this course
- Understanding Modern Log Formats
- Centralized Logging Concepts
- Basic Log Collection and Parsing
- Structured Logging and Log Levels