docs: 26.2 What's New entries for shipped features (DOC-2395)

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

@@ -27,12 +27,42 @@ Redpanda can now export a cluster health summary as Prometheus metrics, so you c
 
 To enable them, set xref:reference:properties/cluster-properties.adoc#health_monitor_metrics_enabled[`health_monitor_metrics_enabled`] to `true` and restart your brokers. See xref:manage:monitoring.adoc#cluster-health[Cluster health] for the available metrics and query patterns.
 
+== Shadowing: migrate schemas from Confluent Schema Registry
+
+Shadowing can now replicate schemas over the Schema Registry HTTP API, including from a Confluent Schema Registry. A shadow link continuously replicates subjects, versions, and compatibility settings into the shadow cluster's Schema Registry, so your applications keep working after cutover without a separate schema migration step. You can also replicate only selected contexts or subjects, and map source contexts to different destination contexts.
+
+See xref:manage:disaster-recovery/shadowing/migrate-schemas-confluent.adoc[Migrate Schemas from Confluent].
+
+== Shadowing: role synchronization
+
+Shadow links can now replicate RBAC roles from the source cluster to the shadow cluster, alongside topics, ACLs, consumer group offsets, and Schema Registry data. Configure role filters to select which roles to sync, so authorization is already in place on the shadow cluster when you fail over.
+
+See xref:manage:disaster-recovery/shadowing/setup.adoc#role-filtering[Configure Shadowing].
+
 == Kafka 4.x client compatibility
 
 Redpanda version 26.2 validates a broader set of non-Java Apache Kafka® clients at their current versions that support Kafka 4.x, in addition to the Apache Kafka Java client. Newly validated clients include `confluent-kafka-go` and Sarama for Go, and `kafka-python` and `confluent-kafka-python` for Python. Validation confirms connectivity and correctness across core Kafka APIs, such as produce, consume, and transaction operations.
 
 See xref:develop:kafka-clients.adoc[Kafka Compatibility] for the full list of validated clients and known exceptions.
 
+== Fetch read coalescing
+
+When many consumers fetch the same partitions, each broker repeats the same read work for every consumer. Fetch read coalescing merges these redundant reads on each shard, reducing read CPU and fetch-response memory under high consumer fan-out. This Enterprise feature is disabled by default: enable it with the `kafka_fetch_read_coalescing_enabled` cluster property.
+
+See xref:manage:cluster-maintenance/fetch-read-coalescing.adoc[Fetch Read Coalescing].
+
+== Per-entity client quota metrics
+
+Aggregate quota metrics can confirm that throttling is happening, but not which client is throttled. Redpanda can now label throttle-time and throughput metrics with the identity of the throttled entity, so you can identify throttled clients by name and right-size quota values based on observed use. These metrics are disabled by default: enable them with the `kafka_per_entity_quota_metrics` cluster property.
+
+See xref:manage:cluster-maintenance/manage-throughput.adoc#track-quota-use-per-entity[Manage Throughput].
+
+== Cloud Topics enabled by default
+
+Cloud Topics no longer require a separate cluster property. When cloud storage is enabled for your cluster (xref:reference:properties/object-storage-properties.adoc#cloud_storage_enabled[`cloud_storage_enabled`] set to `true`), you can create Cloud Topics directly. The `cloud_topics_enabled` cluster property is deprecated.
+
+See xref:develop:manage-topics/cloud-topics.adoc[Manage Cloud Topics].
+
 == Tiered Storage v2
 
 Tiered Storage is now available in two versions. Tiered Storage v2 (`tiered_v2`) adds full compaction support for topics stored in object storage: compaction runs on the data in object storage rather than on local data only, eventually retains only the latest value for each key across the entire partition, and removes tombstone records after the retention period configured by `delete.retention.ms`. Topics using Tiered Storage v2 can also be converted to and from Cloud Topics.