fix(docs): update log injection support [backport 3.10]

[github-actions]

Backport 5494169 from #14031 to 3.10.

With ddtrace v3.10.0 log injection is enabled by default for structured loggers. This PR updates documentation and adds a more release note.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

releasenotes/notes/feat-log-injection-enabled-by-default-395259b0419c7a5f.yaml  @DataDog/apm-python
ddtrace/contrib/_logging.py                                             @DataDog/apm-core-python @DataDog/apm-idm-python
docs/configuration.rst                                                  @DataDog/python-guild

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 279 ± 3 ms.

The average import time from base is: 282 ± 3 ms.

The import time difference between this PR and base is: -2.8 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.010 ms (0.72%)

ddtrace.bootstrap.sitecustomize 1.328 ms (0.48%)

ddtrace.bootstrap.preload 1.328 ms (0.48%)

ddtrace.internal.remoteconfig.client 0.676 ms (0.24%)

ddtrace 0.682 ms (0.24%)

ddtrace.internal._unpatched 0.032 ms (0.01%)

json 0.032 ms (0.01%)

json.decoder 0.032 ms (0.01%)

re 0.032 ms (0.01%)

enum 0.032 ms (0.01%)

types 0.032 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-07-17 20:49:19

Comparing candidate commit 4e0b86e in PR branch backport-14031-to-3.10 with baseline commit 1f8c272 in branch 3.10.

Found 0 performance improvements and 3 performance regressions! Performance is the same for 544 metrics, 3 unstable metrics.

scenario:iastaspectsospath-ospathjoin_aspect

• 🟥 execution_time [+785.383ns; +958.534ns] or [+12.734%; +15.542%]

scenario:iastaspectsospath-ospathnormcase_aspect

• 🟥 execution_time [+340.982ns; +419.130ns] or [+9.768%; +12.007%]

scenario:iastaspectsospath-ospathsplit_aspect

• 🟥 execution_time [+870.935ns; +1066.372ns] or [+17.907%; +21.926%]

[brettlangdon]

This is a new feature, not a bug fix, cannot be backported.