What changes are you introducing?
Adding a chapter on containerized logging.

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

Containerized Satellite 6.20 replaces the traditional file-based logging model with a journald-centric architecture. This is a breaking change: log file paths that administrators have relied on for years (/var/log/foreman, /var/log/candlepin, /var/log/httpd) no longer exist in containerized deployments. Without updated documentation, administrators cannot view service logs, configure log levels for troubleshooting, collect diagnostic data for support cases, or manage log retention to prevent disk exhaustion. The parent epic SAT-43762 (priority: Blocker) explicitly requires that administrators can perform all of these tasks. Every existing script, monitoring integration, and mental model built around traditional log paths must be updated.

• How should logging be handled foremanctl#21
• Handle debug logging for troubleshooting foremanctl#69
• sos report integration / supportability foremanctl#49

Contributor checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.