How to use the @pulumi/awsx.sns function in @pulumi/awsx

console.log(`${url}: Getting`);
        try {
            const res = await fetch.default(url);
        } catch (err) {
            console.log(`${url}: Failed to GET`);
            return;
        }
    }
});

let alarmIndex = 0;

const funcMetric = awsx.lambda.metrics.duration({ function: subscription.func, unit: "Seconds" });
const funcAlarm = funcMetric.createAlarm("alarm" + alarmIndex++, { threshold: 120, evaluationPeriods: 2 });

const topicMetric = awsx.sns.metrics.numberOfMessagesPublished({ topic });
const topicAlarm = topicMetric.createAlarm("alarm" + alarmIndex++, { threshold: 1000, evaluationPeriods: 2 });

const queue = new aws.sqs.Queue("terraform_queue", {
    delaySeconds: 90,
    maxMessageSize: 2048,
    messageRetentionSeconds: 86400,
    receiveWaitTimeSeconds: 10,
    tags: {
        Environment: "production",
    },
});

const queueMetric = awsx.sqs.metrics.sentMessageSize({ queue });
const queueAlarm = queueMetric.createAlarm("alarm" + alarmIndex++, { threshold: 120, evaluationPeriods: 2 });

const restApi = new aws.apigateway.RestApi("MyDemoAPI", {