[DOCS] Add conditional actions highlight (#3190) (#3191)

(cherry picked from commit 6d11e29)

Co-authored-by: Lisa Cawley <[email protected]>

Author: mergify[bot]

docs/en/observability/images/conditional-actions.png

@@ -3,7 +3,7 @@
 
 Here are the highlights of what's new and improved in {minor-version}.
 
-coming[8.0.0]
+coming[8.10.0]
 
 // Other versions:
 // {observability-guide-all}/8.1/whats-new.html[8.1] |
@@ -14,4 +14,14 @@ coming[8.0.0]
 
 // What's new content goes in here. Don't uncomment or remove the tags surrounding this content :)
 
+[discrete]
+== Conditional actions in alerting rules
+
+When creating an {observability} alerting rule, you define conditions that must be met for an alert to occur.
+Now you can also add conditions that affect the actions associated with an alert.
+For example, you might choose to send notifications only if the alert is received between defined hours.
+
+[role="screenshot"]
+image::images/conditional-actions.png[An example of the UI for triggering an action and alert, width=70%]
+
 // end::whats-new[]