What would it take to convince you an attack is real when it has been 100% mitigated and you never saw it in your backend infrastructure?
I ask as the engineering manager for DDoS protection at Cloudflare, and we stop a lot of attacks. But I feel this tension in the communication and product offering... if we do our job well enough that a customer's system does not see the attack, how does a customer see and feel the value?
An example is that as a reverse HTTP proxy we are implicitly also a full TCP proxy for HTTP traffic and so we receive significantly large SYN or ACK floods. We stop these 100% by virtue of being the terminating TCP proxy, but also by using connection tracking, anycast, XDP + eBPF, and so forth... you won't see a single one of these SYN or ACK packets hitting your infrastructure... so what would we have to communicate to convince you that the attack existed?