Actors

1. Application Developer
2. System Administrator
3. External System (optional)
4. Logger System (internal)

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Use Cases

For Application Developer:

• Configure Logger
• Log Message (Info, Debug, Warn, Error, Fatal)
• Change Log Level (at runtime)
• Set Output Format

For System Administrator:

• Define Log Storage Path
• Monitor Log Files
• Rotate Log Files
• Enable/Disable Logging

For External System:

• Collect Log Data
• Analyze Logs

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Logger System (internal responsibilities):

• Filter Log Messages by Level
• Format Log Messages
• Route Logs to Destinations (File, Console, Remote)

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How to Explain in Class

• Introduce the external actors and what they do in real-world use.
• Show how the Logger System enables these actions through individual use cases.
• Emphasize that developers trigger most actions, while admins configure and monitor, and external systems consume logs.