[outages] Possible Cox routing issues in Phoenix

[Mike Bolitho]

There are some interesting routing issues impacting at least the Phoenix
market for Cox. Haven't done a ton of digging yet but we saw about a 25%
drop in ingress traffic on our Cox circuit and a corresponding jump on our
Lumen circuit. Cox is still sending us routes to we're egressing there but
having intermittent connectivity to some resources because of it.

- Mike Bolitho
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