[Blog] Update alerts blog post title and featured image (#10319)

Co-authored-by: Andy Vandervell <[email protected]>

contents/blog/alerts-examples.mdx

@@ -1,9 +1,12 @@
 ---
-title: 5 alerts so you never miss changes to your key metrics
+title: 5 ways to monitor key metrics using PostHog alerts
 date: 2025-01-09
 author:
  - bijan-boustani
 rootpage: /blog
+featuredImage: >-
+  https://res.cloudinary.com/dmukukwp6/image/upload/posthog.com/contents/images/blog/posthog-engineering-blog.png
+featuredImageType: full
 category: General
 tags:
   - Alerts