dr: adds shadowing docs

modules/get-started/pages/release-notes/redpanda.adoc

@@ -7,6 +7,12 @@ This topic includes new content added in version {page-component-version}. For a
 * xref:redpanda-cloud:get-started:whats-new-cloud.adoc[]
 * xref:redpanda-cloud:get-started:cloud-overview.adoc#redpanda-cloud-vs-self-managed-feature-compatibility[Redpanda Cloud vs Self-Managed feature compatibility]
 
+== Shadowing
+
+Redpanda v25.3 introduces xref:deploy:redpanda/manual/resilience/shadowing.adoc[Shadowing], an Enterprise-licensed disaster recovery solution that provides asynchronous, offset-preserving replication between distinct Redpanda clusters. Shadowing enables cross-region data protection by replicating topic data, configurations, consumer group offsets, ACLs, and Schema Registry data with byte-level fidelity.
+
+The shadow cluster operates in read-only mode while continuously receiving updates from the source cluster. During a disaster, you can fail over individual topics or an entire shadow link to make resources fully writable for production traffic. See xref:deploy:redpanda/manual/resilience/shadowing-guide.adoc[Emergency Shadowing Guide] for emergency procedures.
+
 == Connected client monitoring
 
 You can view details about Kafka client connections using the Admin API ListKafkaConnections endpoint. This allows you to view detailed information about about active client connections on a cluster, and identify and troubleshoot problematic clients. For more information, see xref:manage:monitoring.adoc#identify-high-throughput-clients[Monitor Redpanda].