Adjust description

Author: PhilippMatthes

helm/bundles/cortex-nova/alerts/nova.alerts.yaml

@@ -17,8 +17,9 @@ groups:
       summary: "Cortex Scheduling for Nova is down"
       description: >
         The Cortex scheduling service is down. Scheduling requests from Nova will
-        not be served. This is no immediate problem, since Nova will continue
-        placing new VMs. However, the placement will be less desirable.
+        not be served. This is non-critical for vmware virtual machines, but
+        blocks kvm virtual machines from being scheduled. Thus, it is
+        recommended to immediately investigate and resolve the issue.
 
   - alert: CortexNovaKnowledgeDown
     expr: |