The new package, ekg-core, contains the metrics store, modules for
defining metrics, and functions for sampling the metrics.
The counter naming is also changed to include a namespace part. For
example "myapp.requests".
Finally the JSON format has been changed to be more self-descriptive.
Counters now scale orders of magnitudes better as the number of
writers to the same counter increases. Here's the results on our
current benchmark on a 6 core machine:
cores
1 6
before 1.87s 81.09s
after 0.11s 0.32s
Note how the very heavy contention gives a slowdown rather than a
speedup as the number of cores increases, but the new implementation
slows down much less than the old one and is also generally faster.
