Prometheus-client

[BUGFIX] Fix OpenMetrics http negotiation handling

[CHANGE] Counter time series will now always be exposed with _total, and counter metrics will have a _total suffix stripped. This is as the internal data model is now OpenMetrics, rather than Prometheus Text Format (300)
[CHANGE] Samples now use a namedtuple (300)
[FEATURE] Add OpenMetrics exposition and parser (300 306)
[FEATURE] Add Info, Stateset, Enum, GaugeHistogram support for OpenMetrics (300)
[FEATURE] Add timestamp support for Prometheus text format exposition (300)
[FEATURE] Add garbage collection metrics (301)
[ENHANCEMENT] If reading multiprocess file, open it readonly. (307)
[BUGFIX] Fix bug in WSGI app code. (307)
[BUGFIX] Write to multiprocess files directly (315)

[BUGFIX] Fix handing of escaping in parser
[BUGFIX] Fix concurrency issues with timers

[ENHANCEMENT] 4.5x speedup in parser 282
[ENHANCEMENT] Performance improvements for multiproc mode 266
[BUGFIX] Fix FD leak in multiproc mode 269

[CHANGE/ENHANCEMENT] Set default timeout of 30s on pushgateway actions
[ENHANCEMENT] Various performance improvements to multi-process mode
[BUGFIX] Handle QUERY_STRING not being present for WSGI

[BUGFIX] Handle non-ASCII characters in /proc/pid/stat
[BUGFIX] Make check for Python 2.6 work on development versions of Python