Add RabbitMQ 10 to 11 upgrade guide (#7821)

Author: bording

menu/menu.yaml

@@ -858,6 +858,8 @@
         Title: Version 6 to 7
     - Title: RabbitMQ
       Articles:
+      - Url: transports/upgrades/rabbitmq-10to11
+        Title: Version 10 to 11
       - Url: transports/upgrades/rabbitmq-9to10
         Title: Version 9 to 10
       - Url: transports/upgrades/rabbitmq-7to8

transports/upgrades/rabbitmq-10to11.md

@@ -0,0 +1,18 @@
+---
+title: RabbitMQ Transport Upgrade Version 10 to 11
+summary: Instructions on how to upgrade RabbitMQ Transport from version 10 to 11.
+reviewed: 2025-09-09
+component: Rabbit
+related:
+- transports/rabbitmq
+isUpgradeGuide: true
+upgradeGuideCoreVersions:
+ - 9
+ - 10
+---
+
+## SetClientCertificate supports fewer certificate formats
+
+Due to Microsoft making the `X509Certificate2` constructor that accepts content as a `string` file path [obsolete](https://learn.microsoft.com/en-us/dotnet/fundamentals/syslib-diagnostics/syslib0057), the `SetClientCertificate` overload that takes a `path` and a `password` now only supports loading X.509 or PKCS12 certificates.
+
+If a different certificate format is required, the `SetClientCertificate` overload that directly takes an `X509Certificate2` instance can be used instead.