docs(logging.md): add standard logging payload to docs

docs/my-website/docs/proxy/logging.md

@@ -61,6 +61,51 @@ litellm_settings:
 
 Removes any field with `user_api_key_*` from metadata.
 
+## What gets logged?
+
+Found under `kwargs["standard_logging_payload"]`. This is a standard payload, logged for every response.
+
+```python
+class StandardLoggingPayload(TypedDict):
+    id: str
+    call_type: str
+    response_cost: float
+    total_tokens: int
+    prompt_tokens: int
+    completion_tokens: int
+    startTime: float
+    endTime: float
+    completionStartTime: float
+    model_map_information: StandardLoggingModelInformation
+    model: str
+    model_id: Optional[str]
+    model_group: Optional[str]
+    api_base: str
+    metadata: StandardLoggingMetadata
+    cache_hit: Optional[bool]
+    cache_key: Optional[str]
+    saved_cache_cost: Optional[float]
+    request_tags: list
+    end_user: Optional[str]
+    requester_ip_address: Optional[str]
+    messages: Optional[Union[str, list, dict]]
+    response: Optional[Union[str, list, dict]]
+    model_parameters: dict
+    hidden_params: StandardLoggingHiddenParams
+
+class StandardLoggingHiddenParams(TypedDict):
+    model_id: Optional[str]
+    cache_key: Optional[str]
+    api_base: Optional[str]
+    response_cost: Optional[str]
+    additional_headers: Optional[dict]
+
+
+class StandardLoggingModelInformation(TypedDict):
+    model_map_key: str
+    model_map_value: Optional[ModelInfo]
+```
+
 ## Logging Proxy Input/Output - Langfuse
 
 We will use the `--config` to set `litellm.success_callback = ["langfuse"]` this will log all successfull LLM calls to langfuse. Make sure to set `LANGFUSE_PUBLIC_KEY` and `LANGFUSE_SECRET_KEY` in your environment