The Couchbase Server 5.5 release introduces a new feature called "Log Redaction", which allows users to redact sensitive information from logs, such as Personally Identifiable Information (PII) and internal asset data, in compliance with data-related regulations like HIPAA, PCI, and GDPR. Log redaction can be enabled via the UI or CLI, with default settings starting at 'none' and allowing for more levels of redaction to be added in the future. The feature post-processes system logs to identify and scramble sensitive data using a one-way hash function, while still leaving non-redacted versions on local disks for troubleshooting purposes.