Developed and delivered VAT Health Monitoring for Validator Admission Tickets in the anza-xyz/agave repository, focusing on enhancing validator participation integrity during the replay stage. The work introduced health checks to verify that vote accounts meet requirements such as the presence of BLS public keys and sufficient lamport balances. Leveraging Rust for backend and API development, the implementation added admin RPC-based observability, providing structured health responses and robust error handling. This approach improved validator reliability and operator visibility, reducing downtime risk and enabling faster issue diagnosis. The solution was thoroughly tested to ensure accurate monitoring and maintainability within the existing system architecture.