Empty DataPoints when getting s3 metrics from cloudwatch

Hi, when using boto3 to get s3 metrics i get empty metrics, I get the metrics via list_metrics(), I can see them on CloudWatch AWS Web Console, I’ve tried different time spans (from 1minute to 1 Day) - Always return empty.

Changed the units, the Statistics. bah.

cw = boto3.client('cloudwatch')
cw.get_metric_statistics(Namespace='AWS/S3',MetricName='BucketSizeBytes', StartTime=datetime.utcnow() - timedelta(days=1), EndTime=datetime.utcnow(), Period=86400, Statistics=['Sum'],Unit='Bytes',Dimensions=[{'Name':'BucketName', 'Value':'backup-bucket'}])

OUTPUT:

{u'Datapoints': [],
 u'Label': 'BucketSizeBytes',
 'ResponseMetadata': {'HTTPStatusCode': 200,
  'RequestId': 'a5c04a0e-4579-11e5-ab73-add86b87b8d9'}}

[nihitkaul]

Ah! Got it to work by trying bigger time window. I had a timespan of 1 day which was working but it stopped and I had to increase it to 2 days.

[kyleknap]

So here is what I did to get it to work:

from datetime import timedelta
from datetime import datetime

cw = boto3.client('cloudwatch')
bucket = 'mybucketfoo'

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},
        {u'Name': 'StorageType', u'Value': 'StandardStorage'}
    ])


print(response)

The important points are that you need to take from this is: the second StorageType dimension and the start date needs to be more than one day from the current time. I could not find too much documentation in the CloudWatch docs about it. However based on the console, you need that StorageType as well to correctly view the data points. Also, the data point, for me, is delivered daily at 12 AM so my guess the range of a day you specified was too small. However, I was not able to find the official minimum span that you must specify.

Let me know if you have any more questions.