Adds a new config option to exclude specific fields from StandardLoggingPayload
before any callback receives it. This provides a general approach to control
what data is logged across ALL integrations (S3, GCS, Datadog, etc.).
## Changes
1. **litellm/__init__.py**: Added new global setting
`standard_logging_payload_excluded_fields: Optional[List[str]] = None`
2. **litellm/integrations/custom_logger.py**: Modified
`redact_standard_logging_payload_from_model_call_details()` to:
- Remove specified fields entirely from the StandardLoggingPayload
- Works alongside existing `turn_off_message_logging` feature
- Excluded fields take precedence (removed rather than redacted)
3. **tests/**: Added comprehensive test suite with 17 tests covering:
- Single/multiple field exclusion
- Interaction with turn_off_message_logging
- Original payload immutability
- Config loading via setattr (proxy pattern)
- Edge cases (empty list, non-existent fields, None standard_logging_object)
## Usage
```yaml
litellm_settings:
success_callback: ["s3"]
standard_logging_payload_excluded_fields: ["response", "messages"]
```
This removes the `response` and `messages` fields from logs before any
callback processes them, reducing log size and improving privacy compliance.
## Available Fields
The fields match StandardLoggingPayload TypedDict keys including:
- messages, response (large payload fields)
- metadata, hidden_params, model_parameters
- error_str, error_information
- And all other StandardLoggingPayload fields
Closes the need for per-integration flags like `s3_log_response`.
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