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# 使用第 3 適用於 PHP 的 AWS SDK 版在 Amazon CloudWatch 中發佈自訂指標
<a name="cw-examples-publishing-custom-metrics"></a>

指標是有關您系統效能的資料。警示會在您指定的期間，監看單一指標。警示會根據在數個期間與指定閾值相關的指標值，來執行一個或多個動作。

下列範例示範如何：
+ 使用 [PutMetricData](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-monitoring-2010-08-01.html#putmetricdata) 發佈指標資料。
+ 使用 [PutMetricAlarm](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-monitoring-2010-08-01.html#putmetricalarm) 建立警示。

您可以在 GitHub 上 適用於 PHP 的 AWS SDK 取得 的所有範例程式碼。 [ GitHub](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/php/example_code)

## 登入資料
<a name="examplecredentials"></a>

在執行範例程式碼之前，請先設定您的 AWS 登入資料，如中所述[AWS 使用第 3 適用於 PHP 的 AWS SDK 版向 驗證](credentials.md)。然後匯入 適用於 PHP 的 AWS SDK，如 中所述[安裝第 3 適用於 PHP 的 AWS SDK 版](getting-started_installation.md)。

## 發佈指標資料
<a name="publish-metric-data"></a>

 **匯入** 

```
require 'vendor/autoload.php';

use Aws\CloudWatch\CloudWatchClient;
use Aws\Exception\AwsException;
```

 **範例程式碼** 

```
function putMetricData(
    $cloudWatchClient,
    $cloudWatchRegion,
    $namespace,
    $metricData
) {
    try {
        $result = $cloudWatchClient->putMetricData([
            'Namespace' => $namespace,
            'MetricData' => $metricData
        ]);

        if (isset($result['@metadata']['effectiveUri'])) {
            if (
                $result['@metadata']['effectiveUri'] ==
                'https://monitoring.' . $cloudWatchRegion . '.amazonaws.com'
            ) {
                return 'Successfully published datapoint(s).';
            } else {
                return 'Could not publish datapoint(s).';
            }
        } else {
            return 'Error: Could not publish datapoint(s).';
        }
    } catch (AwsException $e) {
        return 'Error: ' . $e->getAwsErrorMessage();
    }
}

function putTheMetricData()
{
    $namespace = 'MyNamespace';
    $metricData = [
        [
            'MetricName' => 'MyMetric',
            'Timestamp' => 1589228818, // 11 May 2020, 20:26:58 UTC.
            'Dimensions' => [
                [
                    'Name' => 'MyDimension1',
                    'Value' => 'MyValue1'

                ],
                [
                    'Name' => 'MyDimension2',
                    'Value' => 'MyValue2'
                ]
            ],
            'Unit' => 'Count',
            'Value' => 1
        ]
    ];

    $cloudWatchRegion = 'us-east-1';
    $cloudWatchClient = new CloudWatchClient([
        'profile' => 'default',
        'region' => $cloudWatchRegion,
        'version' => '2010-08-01'
    ]);

    echo putMetricData(
        $cloudWatchClient,
        $cloudWatchRegion,
        $namespace,
        $metricData
    );
}

// Uncomment the following line to run this code in an AWS account.
// putTheMetricData();
```

## 建立警示
<a name="create-an-alarm"></a>

 **匯入** 

```
require 'vendor/autoload.php';

use Aws\CloudWatch\CloudWatchClient;
use Aws\Exception\AwsException;
```

 **範例程式碼** 

```
function putMetricAlarm(
    $cloudWatchClient,
    $cloudWatchRegion,
    $alarmName,
    $namespace,
    $metricName,
    $dimensions,
    $statistic,
    $period,
    $comparison,
    $threshold,
    $evaluationPeriods
) {
    try {
        $result = $cloudWatchClient->putMetricAlarm([
            'AlarmName' => $alarmName,
            'Namespace' => $namespace,
            'MetricName' => $metricName,
            'Dimensions' => $dimensions,
            'Statistic' => $statistic,
            'Period' => $period,
            'ComparisonOperator' => $comparison,
            'Threshold' => $threshold,
            'EvaluationPeriods' => $evaluationPeriods
        ]);

        if (isset($result['@metadata']['effectiveUri'])) {
            if (
                $result['@metadata']['effectiveUri'] ==
                'https://monitoring.' . $cloudWatchRegion . '.amazonaws.com'
            ) {
                return 'Successfully created or updated specified alarm.';
            } else {
                return 'Could not create or update specified alarm.';
            }
        } else {
            return 'Could not create or update specified alarm.';
        }
    } catch (AwsException $e) {
        return 'Error: ' . $e->getAwsErrorMessage();
    }
}

function putTheMetricAlarm()
{
    $alarmName = 'my-ec2-resources';
    $namespace = 'AWS/Usage';
    $metricName = 'ResourceCount';
    $dimensions = [
        [
            'Name' => 'Type',
            'Value' => 'Resource'
        ],
        [
            'Name' => 'Resource',
            'Value' => 'vCPU'
        ],
        [
            'Name' => 'Service',
            'Value' => 'EC2'
        ],
        [
            'Name' => 'Class',
            'Value' => 'Standard/OnDemand'
        ]
    ];
    $statistic = 'Average';
    $period = 300;
    $comparison = 'GreaterThanThreshold';
    $threshold = 1;
    $evaluationPeriods = 1;

    $cloudWatchRegion = 'us-east-1';
    $cloudWatchClient = new CloudWatchClient([
        'profile' => 'default',
        'region' => $cloudWatchRegion,
        'version' => '2010-08-01'
    ]);

    echo putMetricAlarm(
        $cloudWatchClient,
        $cloudWatchRegion,
        $alarmName,
        $namespace,
        $metricName,
        $dimensions,
        $statistic,
        $period,
        $comparison,
        $threshold,
        $evaluationPeriods
    );
}

// Uncomment the following line to run this code in an AWS account.
// putTheMetricAlarm();
```