Ddtrace

New Features

- internal: Add support for Datadog trace tag propagation
- django: added `DD_DJANGO_INSTRUMENT_TEMPLATES=false` to allow tracing of Django template rendering.
- internal: Add sampling mechanism trace tag
- Add environment variables to write `ddtrace` logs to a file with `DD_TRACE_LOG_FILE`, `DD_TRACE_LOG_FILE_LEVEL`, and `DD_TRACE_FILE_SIZE_BYTES`
- Adds pytest-bdd integration to show more details in CI Visibility product.

Bug Fixes

- starlette: Add back removed `aggregate_resources` feature.
- fastapi: Add back removed `aggregate_resources` feature.
- aiomysql: fix `AttributeError: __aenter__` when using cursors as context managers.
- asgi, starlette, fastapi: Exclude background tasks duration from web request spans.
- asgi: set the `http.url` tag using the hostname in the request header before defaulting to the hostname of the asgi server.
- mypy: Avoid parsing redis asyncio files when type checking Python 2
- starlette: Add back removed `ddtrace.contrib.starlette.get_resource` and `ddtrace.contrib.starlette.span_modifier`.
- fastapi: Add back removed `ddtrace.contrib.fastapi.span_modifier`.
- internal: fix exception raised for invalid values of `DD_TRACE_X_DATADOG_TAGS_MAX_LENGTH`.
- flask_caching: fix redis tagging after the v2.0 release.
- redis: create default Pin on asyncio client. Not having a Pin was resulting in no traces being produced for the async redis client.

Other Changes

- perf: don't encode default parent_id value.
- profiling: add support for protobuf \>=4.0.

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Upgrade Notes

- The profiler `asyncio_loop_policy` attribute has been renamed to `asyncio_loop_policy_class` to accept a user-defined class. This guarantees the same asyncio loop policy class can be used process children.

New Features

- Add tracing support for `aiomysql>=0.1.0`.

- Add support for `grpc.aio`.

- botocore: allow defining error status codes for specific API operations.

See our `botocore` document for more information on how to enable this feature.

- ciapp: detect code owners of PyTest tests

- The memory profile collector can now entirely disabled with the `DD_PROFILING_MEMORY_ENABLED` environment variable.

- psycopg2: add option to enable tracing `psycopg2.connect` method.

See our `psycopg2` documentation for more information.

- Add asyncio support of redis ≥ 4.2.0

Bug Fixes

- Fixes deprecation warning for `asyncio.coroutine` decorator.

- internal: normalize header names in ASM

- profiling: implement `__aenter__` and `__aexit__` methods on `asyncio.Lock` wrapper.

- tracing: fix issue with `ddtrace-run` having the wrong priority order of tracer host/port/url env variable configuration.

- django,redis: fix unicode decode error when using unicode cache key on Python 2.7

- fastapi/starlette: when using sub-apps, formerly a call to `/sub-app/hello/{name}` would give a resource name of `/sub-app`. Now the full path `/sub-app/hello/{name}` is used for the resource name.

- sanic: Don't send non-500s error traces.

- pin protobuf to version `>=3,<4` due to incompatibility with version `4.21`.

- Fixes a performance issue with the profiler when used in an asyncio application.

- The profiler now copy all user-provided attributes on fork.

- pytest: Add note for disabling ddtrace plugin as workaround for side-effects

- Set required header to indicate top level span computation is done in the client to the Datadog agent. This fixes an issue where spans were erroneously being marked as top level when partial flushing or in certain asynchronous applications.

The impact of this bug is the unintended computation of stats for non-top level spans.

Other Changes

- The default number of events kept by the profiler has been reduced to decreased CPU and memory overhead.

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Bug Fixes

- pin protobuf to version `>=3,<4` due to incompatibility with version `4.21`.

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Bug Fixes

- tracing: fix issue with `ddtrace-run` having the wrong priority order of tracer host/port/url env variable configuration.
- sanic: Don't send non-500s error traces.
- Fixes a performance issue with the profiler when used in an asyncio application.

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Bug Fixes

- profiling: implement `__aenter__` and `__aexit__` methods on `asyncio.Lock` wrapper.

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Bug Fixes

- internal: normalize header names in ASM

- Set required header to indicate top level span computation is done in the client to the Datadog agent. This fixes an issue where spans were erroneously being marked as top level when partial flushing or in certain asynchronous applications.

The impact of this bug is the unintended computation of stats for non-top level spans.

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