Elastic-apm

Features
* Added support for aioredis 1.x (1082)
* Added support for aiomysql (1107)
* Added Redis pub/sub instrumentation (1129)
* Added specific instrumentation for AWS SQS (1123)

Bug fixes
* ensure metrics are flushed before agent shutdown (1139)
* added safeguard for exceptions in processors (1138)
* ensure sockets are closed which were opened for cloud environment detection (1134)

Bug fixes
* added destination information to asyncpg instrumentation (1115)
* fixed issue with collecting request meta data with Django REST Framework (1117)
* fixed httpx instrumentation for newly released httpx 0.18.0 (1118)

Bug fixes

* fixed issue with empty transaction name for the root route with Django (1095)
* fixed on-the-fly initialisation of Flask apps (1099)

Bug fixes

* fixed a validation issue with the newly introduced instrumentation for S3, SNS and DynamoDB (1090)

Features

* Add global access to Client singleton object at `elasticapm.get_client()` (1043)
* Add `log_ecs_formatting` config option (1058) (1063)
* Add instrumentation for httplib2 (1031)
* Add better instrumentation for some AWS services (S3, SNS, DynamoDB) (1054)
* Added beta support for collecting metrics from prometheus_client (1083)

Bug fixes

* Fix for potential `capture_body: error` hang in Starlette/FastAPI (1038)
* Fix a rare error around processing stack frames (1012)
* Fix for Starlette/FastAPI to correctly capture request bodies as strings (1041)
* Fix transaction names for Starlette Mount routes (1037)
* Fix for elastic excepthook arguments (1050)
* Fix issue with remote configuration when resetting config values (1068)
* Use a label for the elasticapm Django app that is compatible with Django 3.2 validation (1064)
* Fix an issue with undefined routes in Starlette (1076)

Breaking changes

* Python 2.7 and 3.5 support has been deprecated. The Python agent now requires Python 3.6+ [1021]
* No longer collecting body for `elasticsearch-py` `update` and `delete_by_query` [1013]
* Align `sanitize_field_names` config with the
[cross-agent spec](https://github.com/elastic/apm/blob/3fa78e2a1eeea81c73c2e16e96dbf6b2e79f3c64/specs/agents/sanitization.md).
If you are using a non-default `sanitize_field_names`, surrounding each of your entries with stars (e.g.
`*secret*`) will retain the old behavior. [982]
* Remove credit card sanitization for field values. This improves performance, and the security value of this check was
dubious anyway. [982]
* Remove HTTP querystring sanitization. This improves performance, and is meant to standardize behavior across the
agents, as defined in https://github.com/elastic/apm/pull/334. [#982]
* Remove `elasticapm.tag()` (deprecated since 5.0.0) [1034]

Bug fixes

* Fix for GraphQL span spamming from scalar fields with required flag [1015]