Retrieve CloudWatch Metrics

get-metric.ps1

$payload = @{
    Id = "test"
    MetricStat = @{
        Metric = @{
            Namespace = "EC2Extended"
            MetricName = "RootFreeSpace"
            Dimensions = [System.Array] @(
                @{
                    Name = "path"
                    Value = "/"
                }
                @{
                    Name = "InstanceId"
                    Value = "i-1234"
                }
                @{
                    Name = "device"
                    Value = "nvme0n1p1"
                }
                @{
                    Name = "fstype"
                    Value = "xfs"
                }
            )
        }
        Period = 5
        Stat = "Average"
        Unit = "Bytes"
    }
    
}
$metrics = $(
    aws cloudwatch list-metrics `
        --namespace $payload.MetricStat.Metric.Namespace `
        --metric-name $payload.MetricStat.Metric.MetricName `
        --dimensions $($payload.MetricStat.Metric.Dimensions | ConvertTo-Json ) `
        --output json | ConvertFrom-Json)

$payloadJson = $($payload | ConvertTo-Json -Depth 5)
$payload.MetricStat.Metric.Dimensions | ConvertTo-Json -Compress

$startTime = (Get-Date).Addhours(-4).ToString("yyyy-MM-ddTHH:mm:ssZ")
$endTime = Get-Date -Format "yyyy-MM-ddTHH:mm:ssZ"

echo "${startTime} -> ${endTime}"

aws cloudwatch get-metric-statistics `
    --metric-name RootFreeSpace `
    --start-time $startTime `
    --end-time $endTime `
    --period 3600 `
    --namespace EC2Extended `
    --statistics Average `
    --dimensions $($payload.MetricStat.Metric.Dimensions | ConvertTo-Json -Compress) `
    --region eu-west-1