Deprecation notice for AMP and SXG (cloudflare#24545)

Author: angelampcosta

src/content/docs/speed/optimization/other/amp-real-url/index.mdx

@@ -8,6 +8,10 @@ sidebar:
 
 import { FeatureTable } from "~/components"
 
+:::caution[Deprecation notice]
+AMP Real URL is being deprecated and will be removed on October 20, 2025.
+:::
+
 Cloudflare AMP Real URL leverages signed exchanges to authenticate content when served from Google’s AMP cache. When a supported crawler is detected, AMP Real URL will create a signed exchange for content that is requested from your domain. When using a supported Chromium browser, the page is validated using a signed exchange and is displayed on the user’s device with the original URL of your site.
 
 ## Difference between AMP Real URL and AMP

src/content/docs/speed/optimization/other/signed-exchanges/index.mdx

@@ -11,6 +11,10 @@ head:
 
 import { FeatureTable } from "~/components"
 
+:::caution[Deprecation notice]
+Signed exchanges is being deprecated and will be removed on October 20, 2025.
+:::
+
 Signed exchanges (SXG) is an open standard that makes it possible to cryptographically authenticate the origin of a resource independently of how it is delivered. This authentication allows for a variety of use cases. For example, with SXGs, a search engine can download signed exchanges while users are navigating their search pages. Thus, when a user selects a link to a website, the search engine can serve a cached version of that webpage instead of fetching content from the origin server, improving performance.
 
 This performance improvement also has consequences for SEO. SXGs improve [Core Web Vitals](/web-analytics/data-metrics/core-web-vitals/), such as the Largest Contentful Paint (LCP). Cloudflare found that SXGs improve LCP for 85% of the sites tested and time to first byte (TTFB) for 98% of websites.