Rename Prometheus alerts for consistency

Change-Id: I8ae4ddb5a5ba2402b5c70b3797b2113a5e5424c2
diff --git a/kibana/meta/prometheus.yml b/kibana/meta/prometheus.yml
index 82f5e8e..8b794be 100644
--- a/kibana/meta/prometheus.yml
+++ b/kibana/meta/prometheus.yml
@@ -2,7 +2,7 @@
 {%- if server.get('enabled', False) %}
 server:
   alert:
-    ProcstatRunningKibana:
+    KibanaProcessDown:
       if: >-
         procstat_running{process_name="kibana"} == 0
       {% raw %}