Elastic-apm

Features
* use "unknown-python-service" as default service name if no service name is configured (1438)
* add transaction name to error objects (1441)
* don't send unsampled transactions to APM Server 8.0+ (1442)
* implement snapshotting of certain configuration during transaction lifetime (1431)
* propagate traceparent IDs via Celery (1371)
* removed Python 2 compatibility shims (1463)
Note: Python 2 support was already removed with version 6.0 of the agent, this now removes unused compatibilit shims.

Bug fixes
* fix span compression for redis, mongodb, cassandra and memcached (1444)
* fix recording of status_code for starlette (1466)
* fix aioredis span context handling (1462)

Bugfixes
* fix AttributeError in sync instrumentation of httpx (1423)
* add setting to disable span compression, default to disabled (1429)

Bugfixes
* fix an issue with Sanic exception tracking (1414)
* asyncpg: Limit SQL queries in context data to 10000 characters (1416)

Features
* Add support for Sanic framework (1390)

Bugfixes

* fix compatibility issues with httpx 0.21 (1403)
* fix span_compression_exact_match_max_duration default value (1407)

Bug fixes

* Fix an issue where compressed spans would count against `transaction_max_spans` [1377]
* Make sure HTTP connections are not re-used after a process fork [1374]
* Fix an issue with psycopg2 instrumentation when multiple hosts are defined [1386]
* Update the `User-Agent` header to the new [spec](https://github.com/elastic/apm/pull/514) [#1378]
* Improve status_code handling in AWS Lambda integration [1382]
* Fix `aiohttp` exception handling to allow for non-500 responses including `HTTPOk` [1384]
* Force transaction names to strings [1389]

Other

* Remove unused `http.request.socket.encrypted` context field [1332]
* Remove unused transaction metrics (APM Server handles these metrics instead) [1388]

**Full Changelog**: https://github.com/elastic/apm-agent-python/compare/v6.6.1...v6.6.2

Bug fixes

* Fix some context fields and metadata handling in AWS Lambda support [1368]


**Full Changelog**: https://github.com/elastic/apm-agent-python/compare/v6.6.0...v6.6.1