1. 在CloudWatch中创建指标（Metric）来监控响应时间

import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.Dimension;
import com.amazonaws.services.cloudwatch.model.MetricDatum;
import com.amazonaws.services.cloudwatch.model.PutMetricDataRequest;

AmazonCloudWatch cw = AmazonCloudWatchClientBuilder.defaultClient();
        Dimension dimension = new Dimension()
                .withName("Application")
                .withValue("MyApp");
        MetricDatum datum = new MetricDatum()
                .withMetricName("ResponseTime")
                .withUnit("Seconds")
                .withValue(45.5)
                .withDimensions(dimension);
        PutMetricDataRequest request = new PutMetricDataRequest()
                .withNamespace("MyNamespace")
                .withMetricData(datum);
        cw.putMetricData(request);

2. 创建基于指标的告警（Alarm）来触发报警

import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.ComparisonOperator;
import com.amazonaws.services.cloudwatch.model.Dimension;
import com.amazonaws.services.cloudwatch.model.PutMetricAlarmRequest;
import com.amazonaws.services.cloudwatch.model.StateValue;
import com.amazonaws.services.cloudwatch.model.Statistic;
import com.amazonaws.services.cloudwatch.model.MetricAlarm;

AmazonCloudWatch cw = AmazonCloudWatchClientBuilder.defaultClient();
        Dimension dimension = new Dimension()
                .withName("Application")
                .withValue("MyApp");
        PutMetricAlarmRequest request = new PutMetricAlarmRequest()
                .withAlarmName("ResponseTimeAlarm")
                .withMetricName("ResponseTime")
                .withNamespace("MyNamespace")
                .withStatistic(Statistic.Average)
                .withPeriod(60)
                .withUnit("Seconds")
                .withComparisonOperator(ComparisonOperator.GreaterThanThreshold)
                .withThreshold(40.0)
                .withActionsEnabled(false)
                .withAlarmDescription("Alarm when response time exceeds 40 seconds")
                .withDimensions(dimension);