Create CloudWatch Alarms with Python AWS CDK

This content originally appeared on DEV Community and was authored by chrishart0

Create the alarm

Put this into your Python AWS CDK stack to create an alarm on a bucket asigned to a varibale named bucket

bucket = s3.Bucket...

s3_size_alarm = cloudwatch.Alarm(self, 'bucket_overloaded_alarm',
    metric= cloudwatch.Metric(
        namespace = "AWS/S3", 
        metric_name = "BucketSizeBytes",
        dimensions={
            "BucketName": bucket.bucket_name,
            "StorageType": "StandardStorage",
        },
        period = core.Duration.days(1),
        statistic="Maximum",
    ), 
    evaluation_periods=1, 
    threshold=1000000000 #1 GB
)

This will create a CloudWatch alarm which:

Alarm if the size of the bucket goes over 1GB
Only monitors objects with the StandardStorage type

Relevant CDK docs:

Warning: Don't rely on an alarm watching the BucketSizeBytes metric to make sure your bucket doesn't grow too large. This metric is only collected once a day. Consider opting in to S3 request metrics for more in-depth S3 monitoring

Create alarm action

Alarms aren't very useful if they don't do anything. Setup some actions:

topic = sns.Topic.from_topic_arn(self,'snstopic',"arn:aws:sns:us-east-1:123456789012:alarm-go-ahhhhhhhhhhhh")

s3_size_alarm.add_alarm_action(
    cloudwatch_actions.SnsAction(
        topic = topic
    )
)

Relevant CDK docs:

https://docs.aws.amazon.com/cdk/api/latest/python/aws_cdk.aws_sns/Topic.html#aws_cdk.aws_sns.Topic.from_topic_arn

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This content originally appeared on DEV Community and was authored by chrishart0

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Create the alarm

Create alarm action

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