See if power bi on-prem data gateways are happily running / available, using a service principal account

Test-PowerBIGateway.ps1

Import-Module MicrosoftPowerBIMgmt

$clientId="REDACTED"
$tenantId="REDACTED"
$clientSecret="REDACTED"
$securePassword = ConvertTo-SecureString -String $clientSecret -AsPlainText -Force

$credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $clientId, $securePassword
Connect-PowerBIServiceAccount -ServicePrincipal -Credential $credential -TenantId $tenantId

$gwlist = Invoke-PowerBIRestMethod -Url gateways -Method Get | ConvertFrom-Json
foreach ($gateway in $gwlist) {
    $gwid = $gateway.value.Id
    $gw = Invoke-PowerBIRestMethod -Url "gateways/{$gwid}" -Method Get | ConvertFrom-Json
    if (-not "Live" -eq $gw.gatewayStatus){
        #your code here for when the gateway is not showing all ok
        write-host "panic oh noes"
    }
}

Disconnect-PowerBIServiceAccount