Update cases page; Watcher unavailable on Serverless

Author: kilfoyle

explore-analyze/alerts-cases.md

@@ -36,5 +36,8 @@ If you have a planned outage, maintenance windows prevent rules from generating
 By combining these tools, Elasticsearch and Kibana enable incident response workflows, helping teams to detect, investigate, and resolve issues efficiently.
 
 ## Watcher
+```{applies_to}
+serverless: unavailable
+```
 
 You can use Watcher for alerting and monitoring specific conditions in your data. It enables you to define rules and take automated actions when certain criteria are met. Watcher is a powerful alerting tool for custom use cases and more complex alerting logic. It allows advanced scripting using Painless to define complex conditions and transformations.