• [CHANGE] Python 2.6 is no longer supported. #592
• [CHANGE] The prometheus_multiproc_dir environment variable is deprecated in favor of PROMETHEUS_MULTIPROC_DIR. #624
• [FEATURE] Follow redirects when pushing to Pushgateway using passthrough_redirect_handler. #622
• [FEATURE] Metrics support a clear() method to remove all children. #642
• [ENHANCEMENT] Tag support in GraphiteBridge. #618

[ENHANCEMENT] Add support for python3.9 (#600)
[ENHANCEMENT] Various updates for latest OpenMetrics draft spec (#576 #577)

[FEATURE] Added ASGI application (#512)
[FEATURE] Add support for parsing timestamps in Prometheus exposition format. (#483)
[FEATURE] Add target_info to registries (#453)
[ENHANCEMENT] Handle empty and slashes in label values for pushgateway (#547 #442)
[ENHANCEMENT] Various updates for latest OpenMetrics draft spec (#434 #445 #538 #460 #496)
[ENHANCEMENT] Add HELP output for auto-created metrics (#471)
[ENHANCEMENT] Use mmap.PAGESIZE constant as value for first read. (#505)
[ENHANCEMENT] Add __repr__ method to metric objects, make them debug friendly. (#481)
[ENHANCEMENT] Add observability check to metrics (#455 #520)
[BUGFIX] Fix urlparse in python >= 3.7.6 (#497)
[BUGFIX] Cleaning up name before appending unit on name (#543)
[BUGFIX] Allow for OSError on Google App Engine (#448)

[BUGFIX] multiprocess: don't crash on missing gauge_live/sum files (#424)
[BUGFIX] correctly bind method on Python 2.x (#403)

[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)