config: generate model code from json schema (#4879)

* config: generate model code from json schema

Proposing that the first step towards implementing OpenTelemetry Configuration is to
produce the model code from the json schema. I did a quick search for tools available
to do this and came across datamodel-codegen which seems to do what i expected.

Will open following pull requests (in draft) to use this model code, i just want
to keep these as clearly separated as possible to make reviewing them easier.

Signed-off-by: alex boten <223565+codeboten@users.noreply.github.com>

* update tox command’s deps and allowlist

* add use-union-operator to datamodel-codegen and regenerate models file

* add changelog

* disable union-operator and set target python to 3.10

* ignore generated file for linting

* fix TypeAlias import for python 3.9 in generated models file

* update uv.lock with new dev dependencies

* run precommit

Signed-off-by: alex boten <223565+codeboten@users.noreply.github.com>

* Fix pyright config structure in pyproject.toml

datamodel-codegen section was inserted between [tool.pyright] and its
include/exclude config, causing pyright to check entire repo (599 files)
instead of just included paths. Moved datamodel-codegen section after
pyright config.

* set use-union-operator to true

* Exclude generated models.py from pyright checks

Pyright doesn't recognize that pipe operators are valid with
from __future__ import annotations on Python 3.9.

* Revert uv.lock to test contrib failures

Testing if dev dependency updates in uv.lock are causing
contrib test failures.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* Update uv.lock for datamodel-code-generator dependencies

* add test to verify can import models across python versions

* add ruff ignore for models file and inline imports

* add pylint excludes to test

* set use-union-operator to false & regenerate models

---------

Signed-off-by: alex boten <223565+codeboten@users.noreply.github.com>
Co-authored-by: Mike Goldsmith <goldsmith.mike@gmail.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>

Author: 4 people

.pylintrc

@@ -11,7 +11,7 @@ ignore=CVS,gen,proto
 
 # Add files or directories matching the regex patterns to be excluded. The
 # regex matches against base names, not paths.
-ignore-patterns=
+ignore-patterns=^models\.py$
 
 # Python code to execute, usually for sys.path manipulation such as
 # pygtk.require().

CHANGELOG.md

@@ -52,6 +52,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4913](https://github.com/open-telemetry/opentelemetry-python/pull/4913))
 - bump semantic-conventions to v1.39.0
   ([#4914](https://github.com/open-telemetry/opentelemetry-python/pull/4914))
+- `opentelemetry-sdk`: automatically generate configuration models using OTel config JSON schema
+  ([#4879](https://github.com/open-telemetry/opentelemetry-python/pull/4879))
 
 ## Version 1.39.0/0.60b0 (2025-12-03)