Cloudflare's Web Application Firewall (WAF) is designed to protect against layer 7 attacks, but the sheer volume of requests can lead to false positives in its default configurations. To address this, fine-tuning is necessary, allowing customers to adjust settings based on their specific traffic. The article emphasizes the need for better visibility into why certain rules trigger matches. Cloudflare provides tools like managed rules and custom rules, but the lack of transparency in rule expressions complicates debugging and fine-tuning. Payload logging is a feature that tracks which request fields lead to WAF actions, reducing confusion and helping identify false positives. Previously, the logging process would capture all headers or data related to a matched rule, even if only specific parts were relevant. The updated payload logging compiler now processes array fields more effectively. Instead of logging entire arrays, it only captures the specific elements that triggered a match, streamlining data and reducing the load on logging systems. The changes also improve efficiency by minimizing unnecessary data storage. For instance, when evaluating header matches, the new system logs only those headers that meet the criteria, rather than the entire set. This shift not only clarifies log entries for users but also saves significant storage space, especially for large request bodies. The article highlights how these improvements enhance the overall effectiveness of the WAF while simplifying the troubleshooting process for customers.