Description:
Optional. A list of resource types that this request searches for. If empty, it will search all the [trackable resource types](https://cloud.google.com/kms/docs/view-key-usage#tracked-resource-types). Regular expressions are also supported. For example: * `compute.googleapis.com.*` snapshots resources whose type starts with `compute.googleapis.com`. * `.*Image` snapshots resources whose type ends with `Image`. * `.*Image.*` snapshots resources whose type contains `Image`. See [RE2](https://github.com/google/re2/wiki/Syntax) for all supported regular expression syntax. If the regular expression does not match any supported resource type, an INVALID_ARGUMENT error will be returned.