Gets the labels associated with each node

Get-NodeLabel.ps1

<#
.SYNOPSIS
    Gets the labels associated with each node
.PARAMETER NodeName
    Specify a single node (if not provided all nodes returned)
.PARAMETER Flatten
    Flattens out the labels such that there is a node object returned per label
#>
[CmdletBinding()]
param (
    [Parameter()]
    [string]
    $NodeName,

    [switch] $Flatten
)

if ($NodeName) {
    $nodes = @(kubectl get node $NodeName -o json | ConvertFrom-Json -ErrorAction Stop)
}
else {
    $nodes = @((kubectl get nodes -o json | ConvertFrom-Json -ErrorAction Stop).items)
}

foreach ($node in $nodes) {
    $rawLabels = ($node.metadata.labels | ConvertTo-Json -Compress).Trim('{','}') -split ','
    $labels = foreach ($rawLabel in $rawLabels) {
        $name,$value = $rawLabel.Split(':')
        [pscustomobject]@{
            'LabelName' = $name.Trim("""")
            'LabelValue' = $value.Trim("""")
        }
    }
    $roles = @($labels.LabelName -match 'node-role.kubernetes.io')
    $roleNames = @(foreach ($role in $roles) {
        ($role -split '/')[1]
    })
    if ($roleNames.Count -eq 0) {
        $roleNames = '<none>'
    }
    if ($Flatten) {
        foreach ($label in $labels) {
            [PSCustomObject]@{
                NodeName         = $node.metadata.name
                Role             = $roleNames
                OS               = $node.status.nodeInfo.operatingSystem
                LabelName        = $label.LabelName
                LabelValue       = $label.LabelValue
            }
        }
    }
    else {
        [PSCustomObject]@{
            NodeName         = $node.metadata.name
            Role             = $roleNames
            OS               = $node.status.nodeInfo.operatingSystem
            Labels           = $labels
        }
    }
}