Optional. An optional request ID to identify requests. Specify a unique request ID so that if you must retry your request, the server will know to ignore the request if it has already been completed. The server will guarantee that for at least 60 minutes after the first request. For example, consider a situation where you make an initial request and the request times out. If you make the request again with the same request ID, the server can check if original operation with the same request ID was received, and if so, will ignore the second request. This prevents clients from accidentally creating duplicate commitments. The request ID must be a valid UUID with the exception that zero UUID is not supported (00000000-0000-0000-0000-000000000000).

Optional. A field mask used to clear server-side default values for fields within the instance_properties oneof. When a field in this mask is cleared, the server will not apply its default logic (like inheriting a value from the source) for that field. The most common current use case is clearing default encryption keys. Examples of field mask paths: - Compute Instance Disks: compute_instance_restore_properties.disks.*.disk_encryption_key - Single Disk: disk_restore_properties.disk_encryption_key