feat: lazy load DatadogLLMObsInitParams to reduce import time

- Added DatadogLLMObsInitParams to TYPES_NAMES in _lazy_imports_registry.py
- Added import map entry for DatadogLLMObsInitParams in _TYPES_IMPORT_MAP
- Moved DatadogLLMObsInitParams import from module level to TYPE_CHECKING block in __init__.py
- Follows existing lazy import patterns for type classes
- Automatically tested by existing test_types_lazy_imports() function

litellm/__init__.py

@@ -26,7 +26,6 @@ from typing import (
     overload,
     Type,
 )
-from litellm.types.integrations.datadog_llm_obs import DatadogLLMObsInitParams
 from litellm.types.integrations.datadog import DatadogInitParams
 from litellm._logging import (
     set_verbose,
@@ -1533,6 +1532,9 @@ if TYPE_CHECKING:
     # Custom logger class (lazy-loaded)
     from litellm.integrations.custom_logger import CustomLogger
     
+    # Datadog LLM observability params (lazy-loaded)
+    from litellm.types.integrations.datadog_llm_obs import DatadogLLMObsInitParams
+    
     # Logging callback manager class and instance (lazy-loaded)
     from litellm.litellm_core_utils.logging_callback_manager import LoggingCallbackManager
     logging_callback_manager: LoggingCallbackManager

litellm/_lazy_imports_registry.py

@@ -282,6 +282,7 @@ TYPES_NAMES = (
     "PriorityReservationSettings",
     "CustomLogger",
     "LoggingCallbackManager",
+    "DatadogLLMObsInitParams",
     # Note: LlmProviders is NOT lazy-loaded because it's imported during import time
     # in multiple places including openai.py (via main import)
     # Note: KeyManagementSettings is NOT lazy-loaded because _key_management_settings
@@ -393,6 +394,7 @@ _TYPES_IMPORT_MAP = {
     "PriorityReservationSettings": ("litellm.types.utils", "PriorityReservationSettings"),
     "CustomLogger": ("litellm.integrations.custom_logger", "CustomLogger"),
     "LoggingCallbackManager": ("litellm.litellm_core_utils.logging_callback_manager", "LoggingCallbackManager"),
+    "DatadogLLMObsInitParams": ("litellm.types.integrations.datadog_llm_obs", "DatadogLLMObsInitParams"),
 }
 
 _LLM_PROVIDER_LOGIC_IMPORT_MAP = {