@type t() :: %Envoy.Admin.V3.CertificateDetails.OcspDetails{
__unknown_fields__: [
{field_number :: integer(), Protobuf.Wire.Types.wire_type(),
value :: term()}
],
expiration: Google.Protobuf.Timestamp.t() | nil,
valid_from: Google.Protobuf.Timestamp.t() | nil
}