Extend procstat_running-based metric alerts.

Related-PROD: PROD-35435
Change-Id: I91a2e81c0a3d4b3cab7482010d2431f601c9a07b
diff --git a/linux/meta/prometheus.yml b/linux/meta/prometheus.yml
index 5edbc48..a387b16 100644
--- a/linux/meta/prometheus.yml
+++ b/linux/meta/prometheus.yml
@@ -171,6 +171,7 @@
     CronProcessDown:
       if: >-
         procstat_running{process_name="cron"} == 0
+      for: 2m
       labels:
         severity: critical
         service: system
@@ -180,6 +181,7 @@
     SshdProcessDown:
       if: >-
         procstat_running{process_name="sshd"} == 0
+      for: 2m
       labels:
         severity: critical
         service: system