WIP
L2met formatted output of stuff

I still don't like just dropping this stuff to syslog, but it's a way
forward for now
make appname default to ''
Bring in perks and produce quantile samples of outlet post times
WIP
Refactor so we can pass in arbitrary named values

Helps in adding support for other instrumenting other parts w/o
requiring their own channels
Minor update

Also, emit stats on batches' msgcounts
merge changes
Stream read metrics instead of just incrementing reads
Some batcher tests
simplify
Cleanup
Platform log lines average 500bytes, so emulate that
Platform log lines average 500bytes, so emulate that
Use a variable
Don't output to syslog, listen on a socket (or not)
cleanup
TODO(name):
get some stats from the batch_manager
rename for clarity