New Relic's log obfuscation feature protects sensitive data in logs by masking or hashing it to prevent exposure. This is crucial in an era where personal identifiable information (PII) like names, passwords, and social security numbers are highly sought after. Log obfuscation can be achieved through the use of New Relic's masking technique, which completely removes sensitive information and replaces it with "X" characters, or hashing technique, which converts sensitive data into a cryptic value that can be retrieved later. The feature is available in New Relic's Data Plus account and allows developers to create obfuscation rules based on specific regex patterns, enabling them to secure PII in their logs. By using log obfuscation, developers can protect sensitive data from being exposed, even with access to the application and production environment, or through integrated third-party monitoring tools.