Ddtrace

This release introduces several core improvements and continues addressing pain points in our tooling and testing.

Changes

Core

* Add a PeriodicWorker base class for periodic tasks (934)
* Fix runtime workers not flushing to Dogstatsd (939)
* api: simplify _put codepath (956)
* make psutil requirement more accurate (949 -- thanks chrono)
* writer: log a message when a trace is dropped (942)
* span: use system random source to generate span id (940)
* [core] Add config to set hostname tag on trace root span (938)

Integrations

* Support keyword 'target' parameter when wrapping GRPC channels (946 -- thanks asnr)
* Record HTTP status code correctly when using abort() with Bottle (943 -- thanks equake)
* boto: add support for Python 3.5+ (930)

Documentation

* fix documentation for current_root_span (950 -- thanks chrono)

Tooling

* Run flake8 with Python 3 (957)
* tox: fix ignore path for integrations (954)
* Remove mention of -dev branch in CircleCI (931)

Testing

* [tests] Add benchmarks (952)
* [tests] increase deviation for sampler by service test (948)
* [tests] Fix thread synchronization (947)
* [tests] fix brittle deviation test for tracer (945)
* [tests] fix threading synchronization to opentracer test (944
* [pyramid] Fix dotted name for autopatched config test (932)
* tests: always skip sdist, use develop mode (928)

Read the [full changeset](https://github.com/DataDog/dd-trace-py/compare/v0.25.0...v0.26.0) and the [release milestone](https://github.com/DataDog/dd-trace-py/milestone/42?closed=1).
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This release includes several core improvements and addresses pain points in our testing/CI. The release also adds a new integration for Algolia Search.

Changes

Improvements

- Type cast port number to avoid surprise unicode type (892 -- thanks tancnle)
- Add support for Python 3.7 (864)
- [writer] Enhance Q implementation with a wait based one (862)
- [core] Add Span 'manual.keep' and 'manual.drop' tag support (849)
- [core] Vendor msgpack dependency (848)
- Fix http.url tag inconsistency (899)
- aiohttp: do not set query string in http.url tag (923)
- tornado: do not include query string in the http.url tag (922)
- bottle: fix query string embedded in URL (921)
- django: remove query string from http.url tag (920)

Integrations

- Implement algolia search (894)

Tooling

- [dev/tooling] Enforce single quote strings (884)
- [tests] Leverage tox environment listing to simplify CircleCI tox target list (882)

Testing

- tests/tornado: enhance `test_concurrent_requests` (915)
- doc: disable fixed sidebar (906)
- [opentracer] Refactor time usage (902)
- [opentracer] Fix flaky test based on sleep (901)
- [internal] Add and use RuntimeWorker.join() to remove race condition in testing (887)
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This release introduces a new feature (disabled by default), supports new versions of integrations and improves our testing and tooling.

Changes

Improvements

- [core] Enable requests integration by default (879)
- [core] Fix logging with unset DATADOG_PATCH_MODULES (872)
- [core] Use DEBUG log level for RateSampler initialization (861 -- thanks bmurphey)
- [core] Guard against when there is no current call context (852)
- [core] Collect run-time metrics (819)

Integrations

- [mysql] Remove mysql-connector 2.1 support (866)
- [aiobotocore] Add support for versions up to 0.10.0 (865)

Tooling

- [dev/tooling] Update flake8 to 3.7 branch (856)
- [dev/tooling] Add script to build wheels (853)
- [ci] Use tox.ini checksum to update cache (850)

Testing

- [tests] Use a macro to persist result to workspace in CircleCI (880)
- [tests] add psycopg2 2.8 support (878)
- [aiohttp] Fix race condition in testing (877)
- [docs] Remove confusing testing instructions from README (874)
- [tests] Add support for aiohttp up to 3.5 (873)
- Remove useless __future__ imports (871)
- [testing] Remove nose usage (870)
- [tests] Add support for pytest4 (869)
- [tests] Add testing for Celery 4.3 (868)
- [tests] Enable integration tests in docker-compose environment (863)
- [tests] Do not test celery 4.2 with Kombu 4.4 (858)
- [tests] Fix ddtrace sitecustomize negative test (857)
- [tests] Use spotify cassandra image for tests (855)
- [tests] Fix requests gevent tests (854)
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With this release we are introducing a new configuration system across integrations to generate APM events for [Trace Search & Analytics](https://docs.datadoghq.com/tracing/visualization/search/). The other core changes are the beginnings of a new approach to address issues with tracer loads and improve debugging.

Changes

Improvements

* Trace search client configuration (828)
* [core] fix wrapt wrappers sources (836)
* [core] Add Payload class helper (834)
* [internal] Add rate limited logger (822)

Bugs

* Fix for broken celery tests (839 -- thanks JackWink)

Read the [full changeset](https://github.com/DataDog/dd-trace-py/compare/v0.22.0...v0.23.0) and the [release milestone](https://github.com/DataDog/dd-trace-py/milestone/39?closed=1).
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This release contains a few improvements for not marking a Celery task as an error if it is an expected and allowed exception, for propagating synthetics origin header, and to vendor our `six` and `wrapt` dependencies.

Changes
Improvements
- [celery] Don't mark expected failures as errors (820 -- thanks sciyoshi)
- [core] Propagate x-datadog-origin (821)
- [core] vendor wrapt and six dependencies (755)

Read the [full changeset](https://github.com/DataDog/dd-trace-py/compare/v0.21.1...v0.22.0) and the [release milestone](https://github.com/DataDog/dd-trace-py/milestone/36?closed=1).

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This is a bug fix release that requires no changes to your code.

Included in this release is a fix for some database cursors where we would force `Cursor.execute` and `Cursor.executemany` to return a cursor instead of the originally intended output. This caused an issue specifically with MySQL libraries which tried to return the row count and we were returning a cursor instead.

Changes
Bugs
* [core] Patch logging earlier for ddtrace-run (832)
* [dbapi2] Fix dbapi2 execute/executemany return value (830 )
* [core] Use case-insensitive comparison of header names during extract (826 -- thanks defanator)

Read the [full changeset](https://github.com/DataDog/dd-trace-py/compare/v0.21.0...v0.21.1) and the [release milestone](https://github.com/DataDog/dd-trace-py/milestone/38?closed=1).

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