Elastic-apm

Bugfixes

* ensure that metrics with value 0 are not collected if they have the `reset_on_collect` flag set (615)
* unwrap postgres cursor for newly introduced psycopg2 extensions (621)
* fix pod ID for kubernetes when using the systemd cgroup driver (631)

Bugfixes
* fixed an issue where a `cpu_total` of `0` could cause an exception (610, 611)

Bugfixes
* fixed an issue with DroppedSpans and logging integration (602)
* fixed an issue with processors not being applied to chained exceptions (604)

New Features

* added automatic tagging of LogRecord objects with transaction, trace, and span IDs via a LogRecordFactory (Python 3.2+) (520, 586)
* added `logging` filter and record factory for adding transaction, trace, and span IDs (520, 586)
* added `structlog` processor for adding transaction, trace, and span IDs (520, 586)
* added new public API calls for getting transaction, trace, and span IDs (520, 586)
* added support for chained exceptions in Python 3 (596).
Note that chained exceptions will be captured and stored in Elasticsearch, but not yet
visualized in the APM UI. The UI component will be released in an upcoming Kibana release (7.5 or later).
* added support for using `structlog` for agent logging (591)

Bugfixes

* drop events immediately if a processor returns a falsy value (585)

Bugfixes

* fixed an issue with http server_url and `'VERIFY_SERVER_CERT': False` (570, 578)
* fixed instrumenting of psycopg2 when using their context manager interface (577, 580)
* fixed zerorpc tests (581)
* fixed to correctly check if gevent has patched threading.local (579

Bugfixes
* fixed an issue with empty responses from APM Server's config endpoint (562, 563)
* fixed Windows tests by avoiding time.sleep in breakdown metrics tests (537, 550)
* fixed container ID matching to match CloudFoundry Garden container IDs (523, 564)
* fixed an issue in the urllib instrumentation if no port is set (567)

Other
* Added Python 3.8 RC to the test matrix (565)