# HistoryMetadata
## Properties
**_type** | Option<**String**> | The type of the history record. | [optional]
**description** | Option<**String**> | The description of the history record. | [optional]
**description_key** | Option<**String**> | The description key of the history record. | [optional]
**activity_description** | Option<**String**> | The activity described in the history record. | [optional]
**activity_description_key** | Option<**String**> | The key of the activity described in the history record. | [optional]
**email_description** | Option<**String**> | The description of the email address associated the history record. | [optional]
**email_description_key** | Option<**String**> | The description key of the email address associated the history record. | [optional]
**actor** | Option<[**crate::models::HistoryMetadataParticipant**](HistoryMetadataParticipant.md)> | Details of the user whose action created the history record. | [optional]
**generator** | Option<[**crate::models::HistoryMetadataParticipant**](HistoryMetadataParticipant.md)> | Details of the system that generated the history record. | [optional]
**cause** | Option<[**crate::models::HistoryMetadataParticipant**](HistoryMetadataParticipant.md)> | Details of the cause that triggered the creation the history record. | [optional]
**extra_data** | Option<**::std::collections::HashMap<String, String>**> | Additional arbitrary information about the history record. | [optional]
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