Yesterday I added a graph to track TLS ciphersuite usage over time & immediately spotted an anomaly.
In mid-Feb, on our commercial CDN, CHACHA usage dropped from ~10-12% to ~0.5% & stayed there. The same did not happen on our own CDN so it seemed unlikely to be client behaviour.
Raised it with the CDN vendor & they tied it to a release which accidentally changed the behaviour to pref CHACHA for clients for whom CHACHA is top pref.
Having good data is 💯 #TLS#CDN#Grafana#webStats
