Add alert resend delay param

- set to 2m
- group_interval default change to 4m

Change-Id: I7fb1cd5700c9d14b064457b06e24d4eee21626ad
Related-bug: PROD-35421
diff --git a/metadata/service/alertmanager/container.yml b/metadata/service/alertmanager/container.yml
index 6bc18aa..2fceaf2 100644
--- a/metadata/service/alertmanager/container.yml
+++ b/metadata/service/alertmanager/container.yml
@@ -16,7 +16,7 @@
         route:
           group_by: ['alertname', 'instance']
           group_wait: 60s
-          group_interval: 5m
+          group_interval: 4m
           repeat_interval: 3h
           receiver: default
         inhibit_rule: