Developed a GDPR-compliant redaction feature for the opentelemetry-collector-contrib repository, focusing on secure pseudonymization of sensitive data such as IP addresses. The solution replaced simple hash functions with HMAC-based redaction using HMAC-SHA256 and HMAC-SHA512, enhancing data security while maintaining consistent analytics. Implemented in Go, the work included introducing a configurable HMACKey, updating configuration and processor logic, and expanding unit test coverage to validate functionality and key separation. Documentation was updated to address security considerations and key management, and the feature was validated end-to-end to ensure backward compatibility and acceptable performance for telemetry workloads.