agena

This release is a long time coming and closes the venerable 0.4.x
series of development. Cernan has been put on a good foot for
being open-sourced, has received significant optimizations and
been given three new sinks and one new source. The changes are
as follows:

• ccced68 :: Telemetry now avoids allocing a CKMS if not needed
• 3d88add :: mpsc is split out into the open-source hopper
• 3937bc4 :: native protocol is introduced, Arc sprinkled throughout
• 22668f4 :: Experimental InfluxDB sink is introduced
• 4746766 :: Numerous small allocations in text sources are removed
• f48403a :: Experimental Prometheus sink is introduced
• 4b609f3 :: Cernan's internal data-model becomes that of native protocol
• b1d482f :: Aggregation optimizations, wrt cache access

There were a few things I skipped in the above either because they
were later supplanted or because it was hard to fit the summary in
a short line. But that's the gist!

Signed-off-by: Brian L. Troutwine blt@postmates.com