Can somebody remind me what exactly the difference between these two
is (and/or why we have both?).
From a quick look at the code, they both report data being acked
that's not seen, but with slightly different specifics. I'm not sure
what a good way is to describe the one event vs the other.
Robin, writing Broxygen docs. 
I've wondered the same thing for a long time and can't wait to find out. 
  .Seth
Can somebody remind me what exactly the difference between these two
is (and/or why we have both?).
Yeah, my fault :-P. As best as I can tell (from revisiting the code),
content-gap is a superset of ack-above-hole. Content gaps can also occur
in situations where we're not expecting to see ACKs (for example, due to
split routing, or because we're not processing traffic from the receiver).
I think merging the two into a single content_gap event would make sense.
Vern
content-gap is a superset of ack-above-hole.
(... and to add some confusion, the gap_report event is actually tied
closely to ack_above_hole, not to content_gap.)
processing traffic from the receiver). I think merging the two into a
single content_gap event would make sense.
Ok, something for the todo list.
Robin