使用lambda + boto3访问自定义的cloudwatch指标？

我有一个自定义指标，我可以从bash获取数据：

aws cloudwatch get-metric-statistics --namespace System/Detail/Linux \ --metric-name LoadAverage1Min --start-time 2017-01-04T00:00:00 \ --end-time 2017-01-04T02:00:00 --period 60 --statistics Average \ --dimensions Name=InstanceId,Value=i-03d55dba88912f054 { "Datapoints": [ { "Timestamp": "2017-01-04T00:33:00Z", "Average": 0.0, "Unit": "Count" }, { "Timestamp": "2017-01-04T01:44:00Z", "Average": 0.0, ... etc... 

但它不适用于lambda。 问题是： 如何获取自定义指标的数据？

我正在尝试使用lambda和boto3（对不起，Python初学者）：

 import boto3 import logging from datetime import datetime from datetime import timedelta #setup simple logging for INFO logger = logging.getLogger() logger.setLevel(logging.INFO) #define the connection ec2 = boto3.resource('ec2') cw = boto3.client('cloudwatch') def lambda_handler(event, context): # Use the filter() method of the instances collection to retrieve # all running EC2 instances. filters = [{ 'Name': 'instance-state-name', 'Values': ['running'] } ] #filter the instances instances = ec2.instances.filter(Filters=filters) #locate all running instances RunningInstances = [instance.id for instance in instances] dnow = datetime.now() for instance in instances: inst_name = [tag['Value'] for tag in instance.tags if tag['Key'] == 'Name'][0] if inst_name != 'instances-name-i-need': continue response = cw.get_metric_statistics( Namespace='System/Detail/Linux', MetricName='LoadAverage1Min', Dimensions=[ { 'Name': 'InstanceId', 'Value': 'instance.id' }, ], StartTime=dnow+timedelta(hours=-15), EndTime=dnow, Period=300, Statistics=['Average'] ) print response 

但是当我通过lambdatesting来运行函数时，我只收到空的响应：

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 {u'Datapoints': [], 'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': '98ee...6ba', 'HTTPHeaders': {'x-amzn-requestid': '98ee...6ba', 'date': 'Thu, 05 Jan 2017 22:52:12 GMT', 'content-length': '338', 'content-type': 'text/xml'}}, u'Label': 'LoadAverage1Min'} {u'Datapoints': [], 'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': '98f4...a01', 'HTTPHeaders': {'x-amzn-requestid': '98f4...a01', 'date': 'Thu, 05 Jan 2017 22:52:13 GMT', 'content-length': '338', 'content-type': 'text/xml'}}, u'Label': 'LoadAverage1Min'} {u'Datapoints': [], 'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': '98f8...764', 'HTTPHeaders': {'x-amzn-requestid': '98f8...764', 'date': 'Thu, 05 Jan 2017 22:52:13 GMT', 'content-length': '338', 'content-type': 'text/xml'}}, u'Label': 'LoadAverage1Min'} 

但是我能够从AWS命名空间获取数据

 response = cw.get_metric_statistics( Namespace='AWS/S3',MetricName='BucketSizeBytes', StartTime=datetime.utcnow() - timedelta(days=2) , EndTime=datetime.utcnow(), Period=86400, Statistics=['Average'], Unit='Bytes', Dimensions=[ {'Name': 'BucketName', 'Value': 'bucket-name'}, {u'Name': 'StorageType', u'Value': 'StandardStorage'} ] ) 

指标的数据确实存在：

所以，我怎么能得到它？

 'Value': 'instance.id' 

 'Value': instance.id