observability-pydantic-v2-config-d-pydantic-v2-warns-valid-config-keys-have-changed-i-5e5ca7d5

THEN Replace the deprecated Config.fields dictionary with Pydantic V2's field-level alias and validation_alias parameters. Set `populate_by_name=True` in ConfigDict to allow both original and alias names. For each field that needs an alias, use `Field(alias='AliasName', validation_alias='AliasName')` instead of listing it in Config.fields.

Old pattern:
class Model(BaseModel):
    name: str
    class Config:
        fields = {'name': {'alias': 'NAME'}}

New pattern:
from pydantic import Field, ConfigDict
class Model(BaseModel):
    name: str = Field(alias='NAME', validation_alias='NAME')
    model_config = ConfigDict(populate_by_name=True)