The chaps that keep the CloudFlare global network running do seem a bit busy than usual today. I asked if there were "more attacks than usual" and they replied "Yes" and rushed off to do something.
A recent example illustrates the power of this approach:
Cloudflare's WAF (web application firewall) basically generates
Lua code for the (highly non-linear) maze of firewall rules. An
incoming attack triggers certain rules and the corresponding paths
are turned into linearized traces. These can be heavily optimized
by LuaJIT, much more so than you could ever hope to do with a
static compiler.
When a different attack wave is started, it'll spawn different
traces -- i.e. the generated code dynamically adapts to the
specific attacks.
The result is a much higher firewall throughput than you might be
able to achieve with a data-driven or a static compilation
approach. This directly equates into money saved on machines
needed to handle the load.