Python botoでCloudWatch Metricsの一覧とUnitの単位の対応表を取得する

動機

CloudWatchのMetricsで、それぞれの単位ってなんだろうっていうのを調べたかったけど、良い一覧が無かったので作った。
bash + aws-cliだとめんどくさそうなので、Rubyならサクッと作れそうだけど、お勉強がてらPythonで。

動作環境

• Python 3.4.2
• boto 2.4.1

ソース

#!/usr/bin/env python

import sys
import datetime
import re
from boto.ec2 import cloudwatch

end    = datetime.datetime.utcnow()
start  = end - datetime.timedelta(minutes=10)

cw = cloudwatch.connect_to_region('ap-northeast-1')

def main():

    if len(sys.argv) not in [2,3]:
        print('Usage: python %s <namespace> [separator]' % sys.argv[0])
        quit()

    namespace = sys.argv[1]
    separator = "\t" if len(sys.argv) == 2 else sys.argv[2]
    results   = []

    for metric in cw.list_metrics(namespace=namespace):
        for data in metric.query(start_time=start, end_time=end, statistics='Average'):
            results.append(separator.join([namespace, metric.name, data['Unit']]))

    results = list(set(results))
    for ret in results:
        print(ret)

if __name__ == '__main__':
    main()

使い方

python <script-file-name> <namespace> [separator]

separatorは指定しないとタブ区切りになる。

実行結果

いるかどうか分からないけど、結果だけ知りたい方向けに。
（EC2,EBS,RDSのみ）

$ python get-metrics-unit-type.py AWS/EC2
AWS/EC2 CPUCreditUsage  Count
AWS/EC2 CPUCreditBalance    Count
AWS/EC2 StatusCheckFailed   Count
AWS/EC2 DiskReadOps Count
AWS/EC2 StatusCheckFailed_System    Count
AWS/EC2 DiskWriteBytes  Bytes
AWS/EC2 NetworkOut  Bytes
AWS/EC2 DiskReadBytes   Bytes
AWS/EC2 NetworkIn   Bytes
AWS/EC2 DiskWriteOps    Count
AWS/EC2 StatusCheckFailed_Instance  Count
AWS/EC2 CPUUtilization  Percent

$ python get-metrics-unit-type.py AWS/EBS
AWS/EBS VolumeWriteBytes    Bytes
AWS/EBS VolumeQueueLength   Count
AWS/EBS VolumeReadOps   Count
AWS/EBS VolumeIdleTime  Seconds
AWS/EBS VolumeTotalWriteTime    Seconds
AWS/EBS VolumeWriteOps  Count

$ python get-metrics-unit-type.py AWS/RDS
AWS/RDS FreeableMemory  Bytes
AWS/RDS NetworkTransmitThroughput   Bytes/Second
AWS/RDS DatabaseConnections Count
AWS/RDS WriteIOPS   Count/Second
AWS/RDS ReadIOPS    Count/Second
AWS/RDS ReadLatency Seconds
AWS/RDS WriteThroughput Bytes/Second
AWS/RDS ReadThroughput  Bytes/Second
AWS/RDS FreeStorageSpace    Bytes
AWS/RDS WriteLatency    Seconds
AWS/RDS DiskQueueDepth  Count
AWS/RDS CPUUtilization  Percent
AWS/RDS CPUCreditUsage  Count
AWS/RDS NetworkReceiveThroughput    Bytes/Second
AWS/RDS CPUCreditBalance    Count
AWS/RDS BinLogDiskUsage Bytes
AWS/RDS SwapUsage   Bytes

botoの感想

• 初めは公式じゃなくてコミュニティ製だった（ですよね？）からか、他のSDKとちょっと使用感が違う気がする
• 逆に、実用重視っぽい感じがするので慣れれば他より使いやすいのかも？