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# 将自定义指标数据发布到 CloudWatch
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许多 AWS 服务在以 “`AWS`” 开头的命名空间中发布[自己的指标](https://docs.aws.amazon.com//AmazonCloudWatch/latest/monitoring/aws-services-cloudwatch-metrics.html)。您也可以使用自己的命名空间发布自定义指标数据（只要不是以 `AWS` “” 开头即可）。

## 发布自定义指标数据
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要发布您自己的指标数据，请使用调用 CloudWatchClient's `putMetricData` 方法[PutMetricDataRequest](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/cloudwatch/model/PutMetricDataRequest.html)。`PutMetricDataRequest`必须包括用于数据的自定义命名空间，以及有关[MetricDatum](https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/cloudwatch/model/MetricDatum.html)对象中数据点本身的信息。

**注意**  
您无法指定以“`AWS`”开头的命名空间。以 “`AWS`” 开头的命名空间保留供产品使用。 Amazon Web Services 

 **导入** 

```
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.cloudwatch.CloudWatchClient;
import software.amazon.awssdk.services.cloudwatch.model.Dimension;
import software.amazon.awssdk.services.cloudwatch.model.MetricDatum;
import software.amazon.awssdk.services.cloudwatch.model.StandardUnit;
import software.amazon.awssdk.services.cloudwatch.model.PutMetricDataRequest;
import software.amazon.awssdk.services.cloudwatch.model.CloudWatchException;
import java.time.Instant;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
```

 **代码** 

```
    public static void putMetData(CloudWatchClient cw, Double dataPoint ) {

        try {
            Dimension dimension = Dimension.builder()
                    .name("UNIQUE_PAGES")
                    .value("URLS")
                    .build();

            // Set an Instant object
            String time = ZonedDateTime.now( ZoneOffset.UTC ).format( DateTimeFormatter.ISO_INSTANT );
            Instant instant = Instant.parse(time);

            MetricDatum datum = MetricDatum.builder()
                .metricName("PAGES_VISITED")
                .unit(StandardUnit.NONE)
                .value(dataPoint)
                .timestamp(instant)
                .dimensions(dimension).build();

            PutMetricDataRequest request = PutMetricDataRequest.builder()
                .namespace("SITE/TRAFFIC")
                .metricData(datum).build();

            cw.putMetricData(request);

        } catch (CloudWatchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        System.out.printf("Successfully put data point %f", dataPoint);
     }
```

请参阅上的[完整示例](https://github.com/awsdocs/aws-doc-sdk-examples/blob/f4eaf2b2971805cfb2b87a8e5ab408f83169432e/javav2/example_code/cloudwatch/src/main/java/com/example/cloudwatch/PutMetricData.java) GitHub。

## 更多信息
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+  [使用 Amazon CloudWatch 用户指南中的 Amazon CloudWatch 指标](https://docs.aws.amazon.com//AmazonCloudWatch/latest/monitoring/working_with_metrics.html)。
+ AWS 《 Amazon CloudWatch 用户指南》中的@@ [命名空间](https://docs.aws.amazon.com//AmazonCloudWatch/latest/monitoring/aws-services-cloudwatch-metrics.html)。
+  [PutMetricData](https://docs.aws.amazon.com//AmazonCloudWatch/latest/APIReference/API_PutMetricData.html)在 Amazon CloudWatch API 参考中。