Resource Tagging

Set-AzTagValue.ps1

$ResourceGroups = Get-AzResourceGroup

[System.Environment]::SetEnvironmentVariable('SuppressAzureRmModulesRetiringWarning', 'true', [System.EnvironmentVariableTarget]::User)

foreach ($rg in $ResourceGroups) {
    # Tag ResourceGroups
    $logEntry = (Get-AzLog -ResourceGroupName $rg.ResourceGroupName -StartTime (Get-Date).AddDays(-90))[-1]
    $createdBy = $logEntry.Caller
    $createDate = $logEntry.EventTimestamp

    $tags = @{
        "CreatedBy" = "$createdBy"
        "CreateDate" = "$createDate"
    }
        New-AzTag -ResourceId $rg.ResourceId -Tag $tags
    
    $resources = Get-AzResource -ResourceGroupName $rg.ResourceGroupName
    foreach ($resource in $resources){
        $resourceLogEntry = (Get-AzLog -ResourceId $resource.ResourceId -StartTime (Get-Date).AddDays(-90))[-1]
     
        $createdBy = $resourceLogEntry.Caller
        $createDate = $resourceLogEntry.EventTimestamp

        $rgTags = @{
            "CreatedBy" = "$createdBy"
            "CreateDate" = "$createDate"
        }
        Write-Output $rgTags
        New-AzTag -ResourceId $resource.ResourceId -Tag $rgTags
    }       
}