CloudWatch AgentでEC2インスタンスのメモリ使用率を取得する

[ec2-user@ip-172-16-0-72 ~]$ cat /etc/os-release
NAME="Amazon Linux"
VERSION="2"
ID="amzn"
ID_LIKE="centos rhel fedora"
VERSION_ID="2"
PRETTY_NAME="Amazon Linux 2"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2"
HOME_URL="https://amazonlinux.com/"

sudo yum install amazon-cloudwatch-agent

[ec2-user@ip-172-16-0-72 ~]$ yum info amazon-ssm-agent

Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
Installed Packages
Name : amazon-ssm-agent
Arch : x86_64
Version : 3.0.161.0
Release : 1.amzn2
Size : 135 M
Repo : installed
Summary : Manage EC2 Instances using SSM APIs
URL : http://docs.aws.amazon.com/ssm/latest/APIReference/Welcome.html
License : ASL 2.0
Description : This package provides Amazon SSM Agent for managing EC2 Instances using SSM APIs

$ sudo /opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-config-wizard

=============================================================
= Welcome to the AWS CloudWatch Agent Configuration Manager =
=============================================================
On which OS are you planning to use the agent?
1. linux
2. windows
3. darwin
default choice: [1]:
1

Trying to fetch the default region based on ec2 metadata...
Are you using EC2 or On-Premises hosts?
1. EC2
2. On-Premises
default choice: [1]:
1

Which user are you planning to run the agent?
1. root
2. cwagent
3. others
default choice: [1]:
1

Do you want to turn on StatsD daemon?
1. yes
2. no
default choice: [1]:
2

Do you want to monitor metrics from CollectD?
1. yes
2. no
default choice: [1]: 
2

Do you want to monitor any host metrics? e.g. CPU, memory, etc.
1. yes
2. no
default choice: [1]:
1

Do you want to monitor cpu metrics per core? Additional CloudWatch charges may apply.
1. yes
2. no
default choice: [1]:
2

Do you want to add ec2 dimensions (ImageId, InstanceId, InstanceType, AutoScalingGroupName) into all of your metrics if the info is available?
1. yes
2. no
default choice: [1]:
1

Would you like to collect your metrics at high resolution (sub-minute resolution)? This enables sub-minute resolution for all metrics, but you can customize for specific metrics in the output json file.
1. 1s
2. 10s
3. 30s
4. 60s
default choice: [4]:
4

Which default metrics config do you want?
1. Basic
2. Standard
3. Advanced
4. None
default choice: [1]:
1

Current config as follows:
{
　　"agent": {
　　　　"metrics_collection_interval": 60,
　　　　"run_as_user": "root"
　　　　},
　　"metrics": {
　　　　"append_dimensions": {
　　　　　　"AutoScalingGroupName": "${aws:AutoScalingGroupName}",
　　　　　　"ImageId": "${aws:ImageId}",
　　　　　　"InstanceId": "${aws:InstanceId}",
　　　　　　"InstanceType": "${aws:InstanceType}"
　　　　　　},
　　　　"metrics_collected": {
　　　　　　"disk": {
　　　　　　　　"measurement": [
　　　　　　　　　　"used_percent"
　　　　　　　　　　],
　　　　　　　　"metrics_collection_interval": 60,
　　　　　　　　"resources": [
　　　　　　　　　　"*"
　　　　　　　　　　]
　　　　　　　　},
　　　　　　"mem": {
　　　　　　　　"measurement": [
　　　　　　　　　　"mem_used_percent"
　　　　　　　　　　],
　　　　　　　　"metrics_collection_interval": 60
　　　　　　}
　　　　}
　　}
}
Are you satisfied with the above config? Note: it can be manually customized after the wizard completes to add additional items.
1. yes
2. no
default choice: [1]:
1

Do you have any existing CloudWatch Log Agent (http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/AgentReference.html) configuration file to import for migration?
1. yes
2. no
default choice: [2]:
2

Do you want to monitor any log files?
1. yes
2. no
default choice: [1]:

Saved config file to /opt/aws/amazon-cloudwatch-agent/bin/config.json successfully.
Current config as follows:
{
　　"agent": {
　　　　"metrics_collection_interval": 60,
　　　　"run_as_user": "root"
　　},
　　"metrics": {
　　　　"append_dimensions": {
　　　　　　"AutoScalingGroupName": "${aws:AutoScalingGroupName}",
　　　　　　"ImageId": "${aws:ImageId}",
　　　　　　"InstanceId": "${aws:InstanceId}",
　　　　　　"InstanceType": "${aws:InstanceType}"
　　　　},
　　　　"metrics_collected": {
　　　　　　"disk": {
　　　　　　　　"measurement": [
　　　　　　　　　　"used_percent"
　　　　　　　　],
　　　　　　　　"metrics_collection_interval": 60,
　　　　　　　　"resources": [
　　　　　　　　　　"*"
　　　　　　　　]
　　　　　　},
　　　　　　"mem": {
　　　　　　　　"measurement": [
　　　　　　　　　　"mem_used_percent"
　　　　　　　　],
　　　　　　　　"metrics_collection_interval": 60
　　　　　　}
　　　　}
　　}
}
Please check the above content of the config.
The config file is also located at /opt/aws/amazon-cloudwatch-agent/bin/config.json.
Edit it manually if needed.
Do you want to store the config in the SSM parameter store?
1. yes
2. no
default choice: [1]:

What parameter store name do you want to use to store your config? (Use 'AmazonCloudWatch-' prefix if you use our managed AWS policy)
default choice: [AmazonCloudWatch-linux]

Trying to fetch the default region based on ec2 metadata...
Which region do you want to store the config in the parameter store?
default choice: [ap-northeast-1]

Which AWS credential should be used to send json config to parameter store?
1. AAAABBBBCCCC111122223333(From SDK)
2. Other
default choice: [1]:

Successfully put config to parameter store AmazonCloudWatch-linux.
Program exits now.