v5.0.0

Breaking changes

• implemented type/subtype/action hierachy for spans. Ensure that you run at least APM Server 6.6 (#377)
• renamed tags to labels and changed API. The old API remains for backwards compatibility until 6.0 of the agent (#538)

Other changes

• Added support for recording breakdown metrics (#535)
• Added support for central config management (#511)
• Added instrumentation for urllib2 (Python 2) / urllib.request (Python 3) (#464)
• Added disable_metrics setting (#399)
• Updated elasticsearch instrumentation for 7.x (#482, #483)
• Fixed an issue with opentracing-python 2.1 (#471)
• Fixed an issue with certificate pinning (#497)
• Lowered log level of transport success messages (#527, #531)