Add docs how to add Server header to HTTP responses (#2941)

Author: fivetran-arunsuri

site/content/in-dev/unreleased/configuring-polaris-for-production.md

@@ -217,6 +217,19 @@ polaris.features."SUPPORTED_CATALOG_STORAGE_TYPES" = [ "S3", "Azure" ]
 ```
 Leave out `FILE` to prevent its use. Only include the storage types your setup needs.
 
+### Polaris Server Header
+
+Polaris can emit an informational `Server` HTTP response header using Quarkus' built-in header
+configuration. Add the following property to one of the supported configuration sources (for example,
+`application.properties`) to enable it with the Polaris version string:
+
+```properties
+quarkus.http.header."Server".value=Polaris/${quarkus.application.version}
+```
+
+If you prefer to scope the header to specific environments, only set the property for the desired
+profile (for example, `%prod`).
+
 ### Upgrade Considerations
 
 The [Polaris Evolution](../evolution) page discusses backward compatibility and