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Code Generation Templates

Custom datamodel-code-generator templates used when generating models.py from the OpenTelemetry configuration JSON schema.

dataclass.jinja2

Extends the default dataclass template to support additionalProperties from the JSON Schema. Schema types that allow additional properties (e.g. Sampler, SpanExporter, TextMapPropagator) get:

  • @_additional_properties decorator — captures unknown constructor kwargs
  • additional_properties: ClassVar[dict[str, Any]] annotation — satisfies type checkers without creating a dataclass field

This enables plugin/custom component names to flow through typed dataclasses without a post-processing step.

Usage

Templates are applied automatically when regenerating models:

tox -e generate-config-from-jsonschema

The template directory is configured in pyproject.toml under [tool.datamodel-codegen].

See opentelemetry-sdk/src/opentelemetry/sdk/_configuration/README.md for the full schema update workflow.