Prometheus-client

[FEATURE] Experimental multi-process supported added

It's no longer possible to pass in a dict to `labels()`, instead use `labels(**dict)`.

[FEATURE] labels function supports labels as keyword argurments
[CHANGE] labels function no longer supports being passed a dict
[FEATURE] Pushgateway can now be specified as a URL prefix, allowing for https
[IMPROVEMENT] Cleanup of process collector
[FEATURE] Signatures of decorated functions are now preserved

[FEATURE] Added twisted HTTP exposition
[FEATURE] Added WSGI HTTP exposition
[ENHANCEMENT] Improved consistency of metric help strings
[ENHANCEMENT] Improved docstrings
[ENHANCEMENT] Performance optimisations on inner classes
[BUGFIX] Tests now work on more platforms and Python versions

[BUGFIX] Fix path for pushgateway

Note that `push_to_gateway`/`pushadd_to_gateway` now requires an explicit registry argument, as the usual use case for batch jobs is to push a small custom registry.

[FEATURE] Add `time()` to gauges
[FEATURE] Provide MetricFamilies to make custom collectors easier
[FEATURE] Graphite bridge now allows adding a namespace prefix to exported sample names
[FEATURE] Text format parser
[IMPROVEMENT] Improved docstrings
[IMPROVEMENT] `push_to_gateway`/`pushadd_to_gateway` now requires explicit registry argument
[ENHANCEMENT] Allow value implementation to be pluggable
[ENHANCEMENT] Removed resource warning in tests
[BUGFIX] Pushgateway tests now work on Python 3.4+

[FEATURE] Pushgateway support added
[ENHANCEMENT] Improved error handling in graphite bridge