Ddtrace

This patch release includes fixes for install problems with Alpine Linux as well as for a bug with tag encoding in the profiler.

Fixes

- fix(profiling/http): make sure tags are UTF-8 encoded (1393)
- fix(profiling): allow to build on Alpine Linux (1391)
- fix: don't allow package version to be `None` (1380)
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This release introduces mainly bug fixes as well as some new configuration options for the profiling library.

Profiler
New environment variables have been added to allow you to easily configure and describe your application in Datadog.

- `DD_SITE`: Specify which site to use for uploading profiles. Set to ``datadoghq.eu`` to use EU site.
- `DD_API_KEY`: an alias to `DD_PROFILING_API_KEY`.
- `DD_ENV`: the environment in which your application is running. eg: prod, staging
- `DD_VERSION`: the version of your application. eg: 1.2.3, 6c44da20, 2020.02.13
- `DD_SERVICE`: the service which your application represents.


Changes

Bug fixes
- tracer: stop previous writer if a new one is created (1356)
- Fix task context management for asyncio in Python <3.7 (1353)
- fix(profiling): pthread_t is defined as unsigned long, not int (1347)
- span: handle non-string tag keys (1345)
- fix(profiling): use formats.asbool to convert bool from env (1342)
- fix: avoid context deadlock with logs injection enabled (1338 -- thanks zhammer)
- fix: make C extensions mandatory (1333)
- fix(profiling): allow to override options after load (1332)
- fix(profiling): ignore failure on shutdown (1327)
- logging: fix docs typo (1323)

Integrations

- Add config to omit `django.user.name` tag from request root span (1361 -- thanks sebcoetzee)
- Update error event handler name within SQLAlchemy engine (1324 -- thanks RobertTownley)
- docs(opentracing): add celery example (1329)


Core

- refactor(tracer): remove property for Tracer.context_provider (1371)
- writer: allow configuration of queue maxsize via env var (1364)
- feat(profiling): replace http_client by urllib for uploading (1359)
- feat(profiling): allow to pass service_name to HTTP exporter (1358)
- Updates configuration docs (1360 -- thanks sburns)
- feat(profiling): add the pip install when recompilation is needed (1334)
- tracer: support tracing across `fork()` (1331)
- Allow Profiler to finish upload data in the background when stopped (1322)


Tests
- test(profiling): check for thread presence rather than number of threads (1357)
- aiobotocore: pin to <1.0 (1330)
- ci: allow to use latest pytest version (1326)
- fix(tests/profiling): use a string with setenv, not an int (1321)

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- Fix for an issue introduced by patching classes in the MRO of a Django View class (1625).

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- reintroduce wrapt for patching Django view methods. ([1622](https://github.com/DataDog/dd-trace-py/pull/1622))

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Changes

This patch release addresses an issue when debug logging is enabled:

* fix: avoid context deadlock with logs injection enabled (1338 -- thanks zhammer)

Changeset

Read the [full changeset](https://github.com/DataDog/dd-trace-py/compare/v0.36.0...v0.36.1).
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This release includes support for setting global application tags which will help Datadog better correlate your Python application traces and logs with other services in your infrastructure.

By providing the following settings, `ddtrace` will tag your application's traces and logs appropriately:

- `DD_ENV` environment variable or `ddtrace.config.env`: the environment in which your application is running. eg: `prod`, `staging`.
- `DD_VERSION` environment variable or `ddtrace.config.version`: the version of your application. eg: `1.2.3`, `6c44da20`, `2020.02.13`
- `DD_SERVICE` environment variable or `ddtrace.config.service`: the service which your application represents.

In you are using our logging integration manually, please update your formatter to also include the `dd.env`, `dd.service` and `dd.version` attributes as well. See our docs on [Logs Injection](http://pypi.datadoghq.com/trace/docs/advanced_usage.html?highlight=injection#logs-injection) for more details.

Profiling
If you are using the profiler, please note that `ddtrace.profile` has been renamed to `ddtrace.profiling`.

Changes

Core

- core: Add support for DD_ENV (1240)
- core: Add support for DD_VERSION (1222)
- core: Add support for DD_SERVICE (1280, 1292, 1294, 1296, 1297)
- inject dd.service, dd.env, and dd.version into logs (1270)
- Log exporter support (1276)
- chore: update wrapt to `1.12.1` (1283)
- Update _dd.measured tag support (1302)
- feat(tracer): deprecate global excepthook (1307)


Integrations

- guard against missing botocore response metadata (1264 -- thanks zhammer)
- integrations: prioritize DD_SERVICE (1298)


Profiler
- refactor: rename ddtrace.profile to ddtrace.profiling (1289)
- fix(profiling): fix Lock issue when stored in a class attribute (1301)
- feat(profiling): expose the Profiler object directly in ddtrace.profiling (1303)
- fix(tests/profiling): use a string with setenv, not a int (1321)
- fix(profiling/http): converts nanoseconds timestamp to seconds (1325)

Opentracing

- Add uds_path to ddtrace.opentracer.Tracer (1275 -- thanks worldwise001)


Documentation
- fix import for profiling docs (1271)
- fix profiler example and more details about API usage (1284)
- Fixed typos in ddtrace.contrib.django docs (1286 -- thanks sergeykolosov)
- Fix tiny typo in Issue template (1288)
- Typo in readme (1300 -- thanks Holek)


Testing and tooling
- Check profiler accuracy (1260)
- chore(ci): fix flake8 and pin pytest and readme_renderer (1278)
- fix(tests,profile): do not test the number of locking events (1282)
- fix: do not build wheels on Python 3.4 + run test building wheels in the CI (1287)
- fix(tests,profiling): correct number of frames handling (1290)
- fix(tests, opentracer): flaky threading test (1293)
- build: use latest manylinux images (1305)
- feat(wheels): update to manylinux2010 (1308)

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