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Change log for ZSCALER_DLP

Date	Changes
2026-04-30	- target.file.mime_type: Removed mapping of `filetypename` from `target.file.mime_type` UDM field in order to introduce a more accurate mapping. - target.file.file_type: Mapped `filetypename` raw log field with `target.file.file_type` UDM field using conditional logic if the raw log field `filetypename` is not empty and not equal to `None`. This mapping aligns the recognized file types with their corresponding UDM `file_type` ENUM values. File types not explicitly mapped to a UDM ENUM are mapped with`additional.fields[filetypename]` UDM field.
2026-01-07	- Updated the field mapping for the Zscaler DLP parser. - Please refer to the parser documentation page for information regarding the updated UDM mappings - https://docs.cloud.google.com/chronicle/docs/ingestion/default-parsers/zscaler-dlp#udm_mapping_delta
2025-05-23	- `CSV`: Added support for non-standard/invalid CSV format logs in addition to existing CSV support.
2025-04-30	- Promoted ZSCALER_DLP Premium parser to default. You can see full details in the parser configuration page - https://cloud.google.com/chronicle/docs/ingestion/default-parsers/ingest-zscaler-logs