Tweak alertmanager timeout + simplify down-scale of replicas

prometheus/alertmanager.yml

@@ -25,15 +25,15 @@ route:
   # This way ensures that you get multiple alerts for the same group that start
   # firing shortly after another are batched together on the first 
   # notification.
-  group_wait: 30s
+  group_wait: 5s
 
   # When the first notification was sent, wait 'group_interval' to send a batch
   # of new alerts that started firing for that group.
-  group_interval: 5m
+  group_interval: 10s
 
   # If an alert has successfully been sent, wait 'repeat_interval' to
   # resend them.
-  repeat_interval: 3h 
+  repeat_interval: 30s 
 
   # A default receiver
   receiver: scale-up
@@ -66,3 +66,4 @@ receivers:
   webhook_configs:
     - url: http://gateway:8080/system/alert
       send_resolved: true
+