Logging for Debugging vs Logging for Compliance

Key Concepts

• 1Debugging logs and compliance logs serve different masters: debugging wants rich detail and fast iteration; compliance wants immutability, retention, and access control
• 2The conflict: debugging logs often capture full payloads (which may include personal or payment data), but compliance forbids logging sensitive data or demands it be protected
• 3Compliance logs are evidence — audit trails, consent records, decision rationale — and must be tamper-evident and retained for defined periods, not deleted for space
• 4Debugging logs are ephemeral by design — verbose, short-lived, sampled — and should be scrubbed of sensitive fields precisely because they're widely accessed
• 5LLM I/O is a logging minefield: prompts and completions can contain anything, so PII/PCI redaction must happen before logs are written and stored
• 6Retention policies differ: debug logs age out quickly to control cost and risk; compliance logs must survive for their mandated window regardless of cost
• 7PMs must design two log paths with different access, retention, and redaction rules — conflating them creates either compliance gaps or debugging blind spots

Why It Matters for PMs

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