This adds a new transport socket wrapper for collecting OS-level TCP stats and publishing them as envoy metrics, in either the cluster or listener stats namespace (depending on upstream or downstream use). This allows attributing the TCP stats to specific listeners and clusters.
Signed-off-by: Greg Greenway <ggreenway@apple.com>
Mirrored from https://github.com/envoyproxy/envoy @ b959a46661ec87bba8268a1750506695125f2b06