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Traffic shaping going on?

Doesn't seem directly correlated with outages, and everything seems to be
working ok, but I'm seeing about a 20-30% shift in flows from AS7792 to
AS3356. Seems unlikely that many ISPs have suddenly turned up a level3 link
on the same day/hour, and performance metrics all seem normal. I confess
I've had to turn my attention away from network issues to
systems/DB/security ones lately, so I may have missed something. Anyone
else seeing fairly significant next hop shifts over the previous 24 hours?
All of yesterdays major outages I was sort of suspecting seem to have been
resolved without correlating shifts back.