<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\IdentityGovernance\RoleManagementAlerts\AlertDefinitions\AlertDefinitionsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new AlertDefinitionsRequestBuilderGetRequestConfiguration();
$queryParameters = AlertDefinitionsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "scopeId eq '/' and scopeType eq 'DirectoryRole'";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->identityGovernance()->roleManagementAlerts()->alertDefinitions()->get($requestConfiguration)->wait();