Sourced from ddtrace's releases.

4.2.0

Estimated end-of-life date, accurate to within three months: 05-2027 See the support level definitions for more information.

Upgrade Notes

• tracing
  • The Hooks class (config.<integration>.hooks) is deprecated and will be removed in v5.0. All hook methods (register(), on(), deregister(), emit()) are now no-op and no longer affect span behavior. To interact with spans, use ddtrace.trace_utils.get_current_span() or ddtrace.trace_utils.get_current_root_span() instead.

New Features

• LLM Observability
  • Adds tracing of initialize requests and their responses on modelcontextprotocol/python-sdk servers.
  • This introduces automatic source:otel tagging for evaluations when OpenTelemetry (OTel) tracing is enabled when DD_TRACE_OTEL_ENABLED=true is set. This tag allows the backend to wait for OTel span conversion before processing evaluations.
  • Changes format of MCP server tool call span input, output, and tags to include the full request and response objects.
  • Reasoning token counts are now captured from VertexAI responses.
  • Adds ability to automatically capture the intent and context of an MCP server tool call to modelcontextprotocol/python-sdk servers using the DD_MCP_CAPTURE_INTENT environment variable.
• profiling
  • Add support for asyncio.BoundedSemaphore lock type profiling in Python Lock Profiler.
  • Add support for asyncio.Condition locking type profiling in Python. The Lock profiler now provides visibility into asyncio.Condition usage, helping identify contention in async applications using condition variables.
  • Add support for asyncio.Semaphore lock type profiling in Python Lock Profiler.
  • the Profiler now properly stacks flame graphs for Tasks awaiting and awaited through asyncio.shield.
  • the Profiler now tracks Tasks created through asyncio.TaskGroup.
• AAP
  • Add business logic event detection for Stripe. This feature instruments the payment intent and checkout session creation actions as well as the payment_intent.succeeded, payment_intent.payment_failed and payment_intent.canceled events.
  • Proxy inferred spans now contain events when AppSec is enabled so that they are reported on the App and API Protection Endpoint Catalog.
• DBM
  • Adds container tags support
• DSM
  • Adds container tags support
• tracing
  • Proxy inferred spans now differentiate between API Gateway v1 and v2 apis by emitting the aws.httpapi span name for v2 apis when the API Gateway sets the x-dd-proxy header to aws-httpapi. Additionally, the tag http.route and the resource name of the span now contains the api resource path instead of the path when propagated with the x-dd-proxy-resource-path header.
• vllm
  • Introduces tracing and LLM Observability support for vLLM V1 engine. Requires vLLM >= 0.10.2. See the docs for more information.

Bug Fixes

• CI Visibility
  • This fix resolves an issue where code coverage instrumentation in Python 3.9 would raise an exception while handling line numbers in some corner cases.
• crash tracking
  • Passing in all environment variables to the crashtracker receiver process caused conflicts with export location derivation. This change only passes in the DD_CRASHTRACKING_ERRORS_INTAKE_ENABLED environment variable.
• falcon
  • Fixes DD_TRACE_REMOVE_INTEGRATION_SERVICE_NAMES_ENABLED support, which was previously ignored.
• tracing
  • Proxy inferred spans used to omit the https:// scheme prefix as part of the http.url tag; this caused the entire url to be parsed as the http path.
  • psycopg
    • Fixes an OperationalError that occurred when patching a closed psycopg3 connection.
• dynamic instrumentation
  • fixed an issue that caused condition expressions containing isDefined to result in an evaluation error.
  • fixed an issue that prevented autocomplete information to be extracted from the running application.

... (truncated)

Sourced from ddtrace's changelog.

Changelog

Changelogs for versions not listed here can be found at https://github.com/DataDog/dd-trace-py/releases

---

3.8.0

New Features

• LLM Observability: add processor capability to process span inputs and outputs. See usage documentation [here](https://docs.datadoghq.com/llm_observability/setup/sdk/python/#span-processing).
• CI Visibility: This introduces the ability to gzip the payload when using the evp proxy setup, incurring in less network bandwith consumption.
• Error Tracking: Introduces automatic reporting of handled exceptions. Enabling the feature will report handled exceptions to Error Tracking from the user code, the third party packages code, some specified modules or everything based on configuration. This feature can be controlled using two environment variables: - DD_ERROR_TRACKING_HANDLED_ERRORS=`allthird_party` - DD_ERROR_TRACKING_HANDLED_ERRORS_INCLUDE=`module1, module2, module3.submodule`
• Code Security: IAST support for langchain v0.1.0 and above.
• openai: This introduces tracing support for the OpenAI Responses endpoint.

Bug Fixes

• tracing: Fixes an issue where truncation of span attributes longer than 25000 characters would not consistently count the size of UTF-8 multibyte characters, leading to a unicode string is too large error.

• CI Visibility: This fix resolves an issue where the DD_CIVISIBILITY_ITR_ENABLED was not honored properly.

• tracing: Fixes a bug in distributed tracing where pickling ddtrace.trace.Context fails in coroutines. This regression was introduced in v3.7.0.

• CI Visibility: This fix resolves an issue where pytest-xdist would not exit with the proper status code if ATR was enabled.

• CI Visibility: This fix resolves an issue where ddtrace pytest plugin used with xdist would report test suites as failing even when all tests pass.

• profiling: fixed an issue in the SynchronizedSamplePool where pool could be null when calling into ddog_ArrayQueue_ functions, leading to segfaults in the uWSGI shutdown

• Code Security: IAST: Avoid excessive filtering of stacktrace locations when finding vulnerabilities. After this change, vulnerabilities that were previously discarded will now be reported. In particular, if they were found within code in site-packages or outside of the working directory.

• LLM Observability: Resolves an issue where spans and evaluation metrics were not being sent via Unix sockets.

• dynamic instrumentation: prevent an exception when trying to remove a probe that did not resolve to a valid source code location.

• kafka: This fix resolves an issue where message headers were sent to Kafka brokers that do not support them. Message headers are turned off when the Kafka server responds with UNKNOWN_SERVER_ERROR (-1).

• code origin for spans: fixes a performance issue with exit spans.

• profiling: improve performance of the memory profiler for large heaps. The memory profiler previously did a linear search of tracked allocations for every free, which scaled very poorly with large heaps. Switch to a fast hash map.

---

3.7.2

Bug Fixes

• CI Visibility: This fix resolves an issue where the DD_CIVISIBILITY_ITR_ENABLED was not honored properly.
• tracing: Fixes an issue where truncation of span attributes longer than 25000 characters would not consistently count the size of UTF-8 multibyte characters, leading to a unicode string is too large error.

---

3.7.1

Bug Fixes

... (truncated)

• d0118a4 bump version
• 82e1d43 bump rc version
• bd2f012 Merge branch 'main' into 4.2
• 8b739fe ci: fix release pipeline package validations (#15949)
• 10d3b7f Revert "ci: allow failures on datadog-lambda-python pipeline" (#15944)
• 5891b00 ci: update system-tests (#15950)
• e25c707 feat(ci_visibility): release the new pytest plugin (#15768)
• bc13925 chore(tracer): improve reliability of tracer writer tests (#15927)
• 1db8951 ci: update system-tests (#15940)
• f310c58 ci(benchmarks): fix baseline build wheel downloading (#15901)
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