The request message for updating a TagKey.
.. attribute:: tag_key
Required. The new definition of the TagKey. Only the
description and etag fields can be updated by this
request. If the etag field is not empty, it must match
the etag field of the existing tag key. Otherwise,
FAILED_PRECONDITION will be returned.
google.protobuf.field_mask_pb2.FieldMask
Fields to be updated. The mask may only contain
description or etag. If omitted entirely, both
description and etag are assumed to be significant.
validate_only
bool
Set as true to perform validations necessary
for updating the resource, but not actually
perform the action.