Improve documentation of application security logging

This ticket is marked as critical due to its impact on compliance with:

• Information security standards, such as ISO/IEC 27001 A.8.15 Logging
• Privacy legislation, including:
  • Transparency (Art. 5(1)(a) GDPR)
  • Accountability and demonstrability (Art. 5(2); Art. 24(1) GDPR)
  • Appropriate monitoring and evaluability of processing (Art. 32(1)(d) GDPR)