Level 3 outage 2017-11-07 believed to have caused widespread congestion

[mattmathis]

See Bracket Level 3 outage 2017-11-07

Approximately 50% drop in test volume to servers on L3, between 2017-11-08 06:00:00 UTC and 2017-11-08 12:00:00 UTC

This is reported (Dave Taht) to have caused widespread congestion elsewhere.

[laiyi-ohlsen]

@mattmathis Should this be in data-annotations?