Github user SolidWallOfCode commented on the issue:
https://github.com/apache/trafficserver/pull/1456
The `http` stat measures only HTTP 1.X connections and only those that are
successfully created. If, for example, there is a connection that fails the TLS
handshake, this stat will record it but `http.total_incoming_connections` will
not. Tunnels will also be tracked by `tcp_accept` and not by the `http` stat.
It also looks like HTTP 2 connections are not tracked by that stat either,
which is also distinct. It might be reasonable to either make the existing stat
track both or track them independently and sum.
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