Agent info banner (#661)

* Add an info banner, apply banner to all sections.
Add a compatibility matrix to tech specs

* add v3 banner

* PR feedback

Co-authored-by: Jon Torre <[email protected]>

* PR feedback

Co-authored-by: Jon Torre <[email protected]>

* Update _banners/agent-v3-release.md

* Update Agent version column to contain versions.

* Minor change to remove v from versions

* Update _banners/agent-v3-release.md

---------

Co-authored-by: Jon Cahill-Torre <[email protected]>
Co-authored-by: Jon Torre <[email protected]>
Co-authored-by: Mike Jang <[email protected]>

Author: 3 people

_banners/agent-v3-release.md

@@ -0,0 +1,9 @@
+{{< banner "notice" "NGINX Agent 3.0 is now available" >}}
+
+
+F5 NGINX One Console does not currently support Agent 3.x. If you are using NGINX One Console in your environment, upgrade to the latest Agent 2.x version by following the [Upgrade NGINX Agent](/nginx-agent/installation-upgrade/upgrade/) guide.
+
+Please see the [Technical specifications](/nginx-agent/technical-specifications/) for product compatibility.
+
+
+{{< /banner >}}

content/agent/_index.md

@@ -1,8 +1,12 @@
 ---
 title: NGINX Agent
-description: NGINX Agent is a companion daemon for your NGINX Open Source or NGINX
-  Plus instance.
 url: /nginx-agent/
 cascade:
   logo: NGINX-product-icon.png
+  banner:
+    enabled: true
+    type: deprecation
+    start-date: 2025-05-29
+    end-date: 2025-09-09
+    md: /_banners/agent-v3-release.md
 ---

content/agent/technical-specifications.md

@@ -12,6 +12,17 @@ type:
 
 This document provides technical specifications for NGINX Agent. It includes information on supported distributions, deployment environments, NGINX versions, sizing recommendations, and logging.
 
+## NGINX Agent v3.0 Compatibility 
+{{< bootstrap-table "table table-striped table-bordered" >}}
+| NGINX Product                | Agent Version  |
+|------------------------------|----------------|
+| **NGINX One Console**        | 2.x            |
+| **NGINX Gateway Fabric**     | 3.x            | 
+| **NGINX Plus**               | 2.x, 3.x       |
+| **NGINX Ingress Controller** | 2.x            |
+| **NGINX Instance Manager**   | 2.x            |
+{{< /bootstrap-table >}}
+
 ## Supported Distributions
 
 NGINX Agent can run in most environments. We support the following distributions: