v4.2.1

• fixed an issue with the certificate pinning feature introduced in 4.2.0 (#433, #434)
• fixed incompatibility with eventlet introduced in 4.2.0 (#435, #436)

v4.2.0

• Implemented a new transport queue, which should avoid certain deadlock scenarios (#411)
• Implemented server certificate pinning (#405)
• Moved context.url to context.http.url for requests/urllib3 spans (#393, #394)
• Added support for using route as transaction name in Django 2.2+ (#86, #396)
• Added some randomness to time between requests to APM Server (#426)
• Fixed an issue with custom user models in Django using non-string usernames (#397, #398)
• Fixed an issue with sending kubernetes metadata to the API (#401, #402)
• Fixed an issue with parsing /proc/stat in RHEL/centos 6 (#406, #407)
• Added copyright header to all files, and a CI check (#429)

v4.1.0

• Added support for collecting system and process metrics (#361)
• Added an OpenTracing bridge (#388)
• Added transaction.sampled to errors (#371)
• Added transaction.type to errors (#391)
• Added parsing of /proc/self/cgroup to capture container meta data (#352)
• Added option to configure logging for Flask using a log level (#344)
• Added capture_headers config option (#392)

v4.0.3

• implemented de-dotting of tag names and context keys (#353)
• wrote a quickfix for the boto3/botocore instrumentation (#367)
• fixed an issue with psycopg2 and encoded strings (#366)

v3.0.5

bumped version to 3.0.5

v4.0.2

• fixed another issue in the new v2 transport (#351)

v3.0.4

• fixed an issue with instrumenting redis-py 3.0+

v4.0.1

• fixed an issue with instrumenting redis-py 3.0+
• fixed a multithreading issue that occurs when using threaded workers (#335)

v4.0.0

BREAKING Version 4 of the agent implements a new wire protocol for communicating with
the APM Server. This format is only supported in APM Server 6.5+.

Further breaking changes:

• the undocumented AsyncioHTTPTransport has been removed.
• the flush_interval and max_queue_size settings have been removed.
• new settings introduced: api_request_time and api_request_size.
• Some settings now require a unit for duration or size. See documentation on
  configuration for more information.
• The option to provide a custom date for exceptions and messages has been removed.

Other changes:

• on Python 3.7, use contextvars instead of threadlocals for storing
  current transaction and span. This is a necessary precursor for full asyncio support. (#291)

v3.0.3

• fixed an issue when logging messages that are not strings (#295, #312)
• backported some documentation fixes