Create alarm for each metric generated with a dimension

automatic_cloudwatch_alarms.sh

#!/usr/bin/env bash

# metric math alarms 
aws cloudwatch put-metric-alarm --alarm-name test2 --evaluation-periods 2 --alarm-actions arn:aws:sns:eu-west-1:037559324442:cloudwatch-sqs --threshold 1 --comparison-operator GreaterThanThreshold --metrics '[{"Id":"e1","Label":"Expression1","ReturnData":true,"Expression":"SUM(METRICS()/2)"},{"Id":"m1","ReturnData":false,"MetricStat":{"Metric":{"MetricName":"Available","Dimensions":[{"Name":"WorkspaceId","Value":"ws-fdw4f2pt8"}],"Namespace":"AWS/WorkSpaces"},"Period":300,"Stat":"Average"}}]'

metrics=$(cat ~/temp/temp2.json |

#temp=$(aws cloudwatch list-metrics --metric-name CPUUtilization --namespace AWS/EC2 --region eu-west-1 --query "Metrics[?Dimensions[0].Name == 'InstanceId']" | 

# when using timestamp as an ID - now | tostring | split(".")[1]
 
jq '[. | 
    [
        keys[] as $k | .[$k] | .key=$k
    ] | .[] | 
    {
        "Id": [ "m", .key | tostring ] | join(""),
        "ReturnData": false,
        "MetricStat": {
            "Metric": {
                "MetricName": "CPUUtilization",
                "Dimensions": [{
                    "Name": "CacheClusterId",
                    "Value": .Dimensions[0].Value
                }],
                "Namespace": .Namespace
            },
            "Period": 300,
            "Stat": "Average"
        }
}]')

putAlarm()
{    
    slice=$(echo $1 | jq --argjson batch $2 --argjson len $3 '
        .[$len-$batch:$len] | . += 
        [{
            "Id": "e1",
            "Label": "Expression1",
            "ReturnData": true,
            "Expression": "AVG(METRICS())"
        }]') && \
    name="cli-script-alarm-${3}" 
    if [ $( echo $slice | jq 'length' ) -gt 1 ] 
    then 
        aws cloudwatch put-metric-alarm \
        --alarm-name $name \
        --evaluation-periods 2 \
        --alarm-actions arn:aws:sns:eu-west-1:037559324442:cloudwatch-sqs \
        --threshold 1 \
        --comparison-operator GreaterThanThreshold \
        --metrics "$slice" &&
        printf "Alarm \"$name\" has been created\n"
    fi
    
}

len=$( echo $metrics | jq 'length')

until [ $len -lt 0 ]
do      
    length=$len 
    len=`expr $len - 9`

    if [ $length -lt 9 ]
    then 
        putAlarm "$metrics" 9 $length
        batch=`expr 9 + $len`        
        putAlarm "$metrics" $batch $batch
    else    
        putAlarm "$metrics" 9 $length
    fi
done

# to delete the alarms 
temp=$( aws cloudwatch describe-alarms --query "MetricAlarms[?contains(AlarmName,'cli-script-alarm')].AlarmName" --output text ) && 
aws cloudwatch delete-alarms --alarm-names $temp