How do I get the most recent Cloudwatch metric data for an instance using Boto?

Question

I\'m trying to get the most recent data for CPU utilization for an instance (actually, several instances, but just one to start with), however the following call doesn\'t return

Answer 1

I was also seeing no data returned when setting units to "Megabytes", while setting units to "Bytes" returned data.

Both are allowed in the API reference.

data = conn.get_metric_statistics(period=60,start_time=start,end_time=end,metric_name="NetworkOut",namespace="AWS/EC2",statistics="Average",unit="Megabytes",dimensions={'InstanceId':'XXXXXX'})
print "data length: %d"%len(data)
    # data length: 0


data = conn.get_metric_statistics(period=60,start_time=start,end_time=end,metric_name="NetworkOut",namespace="AWS/EC2",statistics="Average",unit="Bytes",dimensions={'InstanceId':'XXXXXX'})
print "data length: %d"%len(data)
    # data length: 59