AWS CLI memorandum - Getting CPU Metrics on CloudWatch

This is just memorandum to extract CPUUtilization with AWS CLI because I'm considering using Zabbix or Sensu to monitor the instances on AWS and thinking of how to extract each metrics, such as CPU usage, Memory usage, or Traffic.
Writing plugins will be helpful but the simplest way and using functions which they offer are easier than writing plugins, I believe.

Listing metrics of AWS/EC2

$ aws cloudwatch list-metrics --namespace AWS/EC2 --dimensions Name=InstanceType,Value=t1.micro
{
    "Metrics": [
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "NetworkOut"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "DiskWriteOps"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "DiskWriteBytes"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "CPUUtilization"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "DiskReadOps"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "DiskReadBytes"
        }, 
        {
            "Namespace": "AWS/EC2", 
            "Dimensions": [
                {
                    "Name": "InstanceType", 
                    "Value": "t1.micro"
                }
            ], 
            "MetricName": "NetworkIn"
        }
    ]
}

Getting metrics of CPUUtilization

$ aws cloudwatch get-metric-statistics \
--namespace AWS/EC2 \
--metric-name CPUUtilization \
--dimensions Name=InstanceId,Value=i-xxx \
--statistics Average \
--start-time `date -u '+%FT%TZ' -d '10 mins ago'` \
--end-time `date -u '+%FT%TZ'` \
--period 60
{
    "Datapoints": [
        {
            "Timestamp": "2013-11-30T11:13:00Z", 
            "Average": 5.6659999999999995, 
            "Unit": "Percent"
        }, 
        {
            "Timestamp": "2013-11-30T11:18:00Z", 
            "Average": 6.6659999999999995, 
            "Unit": "Percent"
        }
    ], 
    "Label": "CPUUtilization"
}

Extracting average with jq command

$ aws cloudwatch get-metric-statistics \
--namespace AWS/EC2 \
--metric-name CPUUtilization \
--dimensions Name=InstanceId,Value=i-xxx \
--statistics Average \
--start-time `date -u '+%FT%TZ' -d '10 mins ago'` \
--end-time `date -u '+%FT%TZ'` \
--period 60 | jq '.Datapoints[0] | .Average'
6.6659999999999995

• Reference
• AWS Namespaces
• AWS CLI CloudWatch
• jq