Prometheus-client

[FEATURE] Support all modes of mutli-process operation in mutliproc mode, and it's a little faster too
[FEATURE] Add platform collector by default to add information about the Python/JVM runtime
[ENHANCEMENT] Httpserver now multi-threaded
[BUGFIX] Use namespace/subsystem correctly in multiproc mode
[BUGFIX] Support labelnames being an empty list

[FEATURE] Support basic auth and allow for custom handlers for talking to the pushgateway
[BUGFIX] Support trailing commas in parser

[FEATURE] Add optional describe() method on collectors, fallback to "collect() if not present and explcitly requested on the registry. This is enabled on the default registry
[FEATURE] Use describe() method to raise an exception on duplicate time series names in a registry
[FEATURE] Add support for ?name[]=xxx to limit what metrics names are returned over http from a registry
[BUGFIX] An exception in a collector now causes a 500 rather than a blank 200
[BUGFIX] Disallow colon in label names
[BUGFIX] Correctly parse untyped metrics into one metric, not several

[BUGFIX] Gauge.set_to_current_time to return correct value on Python3

[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