Use cluster.local URL to query prometheus

test/pytest/test_prometheus.py

@@ -14,11 +14,8 @@ def test_prometheus_alerts(host):
 
     print("Starting prometheus test...")
 
-    prometheus_ip = host.check_output(
-        'dig +short '
-        'monitoring-prometheus-oper-prometheus.oas.svc.cluster.local '
-        '@10.43.0.10')
-    url = 'http://{0}:9090/api/v1/alerts'.format(prometheus_ip)
+    url = 'http://monitoring-prometheus-oper-prometheus.oas.svc.cluster.local:9090/api/v1/alerts'
+
     alert_json = json.loads(host.check_output('curl ' + url))
     status = alert_json["status"]
     alerts = alert_json["data"]["alerts"]