async fn list_command_invocations(
        &self,
        input: ListCommandInvocationsRequest,
    ) -> Result<ListCommandInvocationsResult, RusotoError<ListCommandInvocationsError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "AmazonSSM.ListCommandInvocations");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, ListCommandInvocationsError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response)
            .deserialize::<ListCommandInvocationsResult, _>()
    }
<p>An invocation is copy of a command sent to a specific instance. A command can apply to one or more instances. A command invocation applies to one instance. For example, if a user runs SendCommand against three instances, then a command invocation is created for each requested instance ID. ListCommandInvocations provide status about command execution.</p>
rusoto/services/ssm/src/generated.rs