Prometheus-client

[ENHANCEMENT] Multiprocess exposition speed boost (421)
[ENHANCEMENT] optimize openmetrics text parsing (~4x perf) (402)
[ENHANCEMENT] Add python3.7 support (418)
[ENHANCEMENT] Change exemplar length limit to be only for label names+values (397)
[BUGFIX] Disable gcCollector for pypy (380)

[ENHANCEMENT] Better exceptions on exposition failure (364)
[BUGFIX] Fix deadlock in gcCollector, metrics are now different (371)
[BUGFIX] Fix thread leak in Python 3.7 (356)
[BUGFIX] Make the format strings compatible with Python 2.6 (361)
[BUGFIX] parser: ensure samples are of type Sample (358)

[ENHANCEMENT] Be more resilient to certain file corruptions (329)
[ENHANCEMENT] Permit subclassing of MetricsHandler (339)
[ENHANCEMENT] Updates based on latest OpenMetrics draft spec discussions (338 346)
[BUGFIX] In multiprocess mode, ensure that metrics initialise to the correct file (346)
[BUGFIX] Avoid re-entrant calls to GC collector's callback (343)

[BUGFIX] Disable GCCollector in multiprocess mode to prevent a deadlock

[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)