#2451 include non-polling feature in What's New (#518)

Co-authored-by: Joyce Fee <[email protected]>

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

@@ -32,6 +32,16 @@ Redpanda now prioritizes xref:manage:cluster-maintenance/cluster-balancing.adoc[
 == Managed identities for Azure
 Redpanda xref:manage:tiered-storage.adoc#tabs-1-microsoft-absadls[Tiered Storage] now supports https://learn.microsoft.com/en-us/entra/identity/managed-identities-azure-resources/overview[managed identities for Azure] resources, similar to the existing support for IAM roles for self-hosted deployments on AWS and GCP. This provides a more secure alternative to static credentials, like access keys. Managed identities allow Redpanda clusters deployed on Azure virtual machines and on Azure Kubernetes Service (AKS) to access Azure Blob Storage (ABS) and other services without storing credentials in the cluster configuration.
 
+== Improved fetch latency
+
+A new property, xref:reference:properties/cluster-properties.adoc#fetch_read_strategy[`fetch_read_strategy`], by default sets new and migrated clusters with a non-polling strategy to fulfill fetch requests. The backend is signaled when a partition has new data, so it doesn't need to repeatedly read from every partition in the fetch. This should improve fetch latency and CPU utilization for most workloads.
+
+To revert to the previous polling strategy, run:
+
+```
+rpk cluster config set fetch_read_strategy polling
+```
+
 == Validation before topic recovery or cluster restore
 
 Before topic recovery or cluster restore, the properties xref:reference:cluster-properties.adoc#cloud_storage_recovery_topic_validation_mode[`cloud_storage_recovery_topic_validation_mode`] and xref:reference:cluster-properties.adoc#cloud_storage_recovery_topic_validation_depth[`cloud_storage_recovery_topic_validation_depth`] now check that partition manifests exist and confirm that there are no connection issues to object storage.