Attack Signature False Positive Mode

Yes, it means F5 Advanced WAF will create the pattern and detect false positive attack signature violations based on traffic similarity. Numerous common requests are most likely benign. Requests similar to the majority of requests are most likely benign. When you enable "Potential False Positive Detection" the system will automatically develop multiple request similarity tests, and requests which pass the tests are considered safe. Real attack attempts almost always contain outliers such as strings or meta characters which are dissimilar to most traffic. These are detected and blocked if the signature is enforced. There's a lot of math going on behind the scenes.