DOC-1939 add schema validation topic in cloud docs

local-antora-playbook.yml

@@ -18,7 +18,7 @@ content:
   - url: .
     branches: HEAD
   - url: https://github.com/redpanda-data/documentation
-    branches: [main, v/*, shared, site-search]
+    branches: [DOC-1943-single-source-schema-id-validation, v/*, shared, site-search]
   - url: https://github.com/redpanda-data/docs-site
     branches: [main]
     start_paths: [home]

modules/ROOT/nav.adoc

@@ -409,6 +409,7 @@
 *** xref:manage:schema-reg/schema-reg-ui.adoc[]
 *** xref:manage:schema-reg/schema-reg-api.adoc[]
 *** xref:manage:schema-reg/schema-reg-authorization.adoc[Schema Registry Authorization]
+*** xref:manage:schema-reg/schema-id-validation.adoc[]
 *** xref:manage:schema-reg/record-deserialization.adoc[Deserialization]
 *** xref:manage:schema-reg/programmable-push-filters.adoc[Programmable Push Filters]
 *** xref:manage:schema-reg/edit-topic-configuration.adoc[Edit Topic Configuration]

modules/get-started/pages/whats-new-cloud.adoc

@@ -12,6 +12,10 @@ This page lists new features added to Redpanda Cloud.
 
 xref:get-started:cluster-types/serverless.adoc[Serverless] on AWS is now generally available (GA). This release includes private networking with AWS PrivateLink and the ability to export metrics to third-party monitoring systems. Serverless is the easiest and fastest way to begin streaming data with Redpanda. Start small and iterate on a budget, with confidence that your cluster can scale to production.
 
+=== Enable schema ID validation
+
+You can now enable xref:manage:schema-reg/schema-id-validation.adoc[schema ID validation] by xref:manage:cluster-maintenance/config-cluster.adoc[configuring the `enable_schema_id_validation` cluster property]. This controls whether Redpanda validates schema IDs in records and which topic properties are enforced. Use caution when enabling this property, because it could cause decompression across topics and increase CPU load. 
+
 == January 2026
 
 === Redpanda Connect updates

modules/manage/pages/schema-reg/schema-id-validation.adoc

@@ -0,0 +1,4 @@
+= Schema ID Validation
+:description: Learn about schema ID validation for clients using SerDes that produce to Redpanda brokers, and learn how to configure Redpanda to inspect and reject records with invalid schema IDs.
+
+include::ROOT:manage:schema-reg/schema-id-validation.adoc[tag=single-source]