Set x-keep-typed-in-additional-properties on UsageSummary schemas (#3693)

* Support x-keep-typed-in-additional-properties in Python model generator

When a schema sets `x-keep-typed-in-additional-properties: true`, emit a
`_keep_typed_in_additional_properties = True` class attribute. In Python all
fields are already stored in `_data_store` and accessible via `model["key"]`
regardless of type; this marker makes the intent explicit for tooling.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* docs: annotate _keep_typed_in_additional_properties as a cross-SDK semantic marker

In Python, typed fields are already reachable via bracket notation through
_data_store, so no runtime behaviour change is required. The marker makes the
flag visible for introspection and aligns semantics with other language SDKs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Regenerate client from commit 3677df7 of spec repo

---------

Co-authored-by: Charlie Zhang <charlie.zhang@datadoghq.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: 4 people

.generator/schemas/v1/openapi.yaml

@@ -24110,6 +24110,7 @@ components:
           format: int64
           type: integer
       type: object
+      x-keep-typed-in-additional-properties: true
     UsageSummaryDateOrg:
       description: |-
         Global hourly report of all data billed by Datadog for a given organization.
@@ -25429,6 +25430,7 @@ components:
           format: int64
           type: integer
       type: object
+      x-keep-typed-in-additional-properties: true
     UsageSummaryResponse:
       description: |-
         Response summarizing all usage aggregated across the months in the request for
@@ -26776,6 +26778,7 @@ components:
           format: int64
           type: integer
       type: object
+      x-keep-typed-in-additional-properties: true
     UsageSyntheticsAPIHour:
       description: Number of Synthetics API tests run for each hour for a given organization.
       properties:

.generator/src/generator/templates/model_generic.j2

@@ -74,6 +74,11 @@ class {{ name }}(ModelNormal):
 {%- if model.nullable %}
     _nullable = True
 {%- endif %}
+{%- if model.get("x-keep-typed-in-additional-properties") %}
+    # Cross-SDK semantic marker. In Python, typed fields are already accessible via
+    # bracket notation (model["key"]) through _data_store, so no runtime change is needed.
+    _keep_typed_in_additional_properties = True
+{%- endif %}
 
 {%- if model.properties %}
     @cached_property

src/datadog_api_client/v1/model/usage_summary_date.py

@@ -19,6 +19,10 @@
 
 
 class UsageSummaryDate(ModelNormal):
+    # Cross-SDK semantic marker. In Python, typed fields are already accessible via
+    # bracket notation (model["key"]) through _data_store, so no runtime change is needed.
+    _keep_typed_in_additional_properties = True
+
     @cached_property
     def openapi_types(_):
         from datadog_api_client.v1.model.usage_summary_date_org import UsageSummaryDateOrg

src/datadog_api_client/v1/model/usage_summary_date_org.py

@@ -14,6 +14,10 @@
 
 
 class UsageSummaryDateOrg(ModelNormal):
+    # Cross-SDK semantic marker. In Python, typed fields are already accessible via
+    # bracket notation (model["key"]) through _data_store, so no runtime change is needed.
+    _keep_typed_in_additional_properties = True
+
     @cached_property
     def openapi_types(_):
         return {

src/datadog_api_client/v1/model/usage_summary_response.py

@@ -20,6 +20,10 @@
 
 
 class UsageSummaryResponse(ModelNormal):
+    # Cross-SDK semantic marker. In Python, typed fields are already accessible via
+    # bracket notation (model["key"]) through _data_store, so no runtime change is needed.
+    _keep_typed_in_additional_properties = True
+
     @cached_property
     def openapi_types(_):
         from datadog_api_client.v1.model.logs_by_retention import LogsByRetention