Merge pull request #2516 from redis/DOC-6047-sch-stub-page-for-rs

DOC-6047 SCH config page for RS

Author: andy-stark-redis

content/develop/clients/sch.md

@@ -69,7 +69,9 @@ curl -k -X PUT -H "accept: application/json" \
 ```
 
 {{< note >}}SCH is not supported for
-[Kubernetes]({{< relref "/operate/kubernetes" >}}) clusters.
+[Kubernetes]({{< relref "/operate/kubernetes" >}}) clusters
+and is supported on Redis Enterprise only for
+[rolling upgrades]({{< relref "/operate/rs/installing-upgrading/upgrading/upgrade-cluster#rolling-upgrade" >}}).
 {{< /note >}}
 
 SCH is enabled automatically on the client side during connection

content/operate/rs/clusters/configure/sch.md

@@ -0,0 +1,31 @@
+---
+Title: Smart client handoffs
+alwaysopen: false
+categories:
+- docs
+- operate
+- rs
+description: Enable Smart client handoffs for your Redis Enterprise Software cluster.
+linkTitle: Smart client handoffs
+weight: 90
+---
+
+Smart client handoffs (SCH) is a feature of Redis Cloud and Redis Enterprise servers that lets them actively notify clients about planned server maintenance shortly before it happens. This lets a client reconnect or otherwise respond gracefully without significant interruptions in service.
+See [Smart client handoffs]({{< relref "/develop/clients/sch" >}}) for more information about SCH.
+
+{{< note >}}SCH is supported only for [rolling upgrades]({{< relref "/operate/rs/installing-upgrading/upgrading/upgrade-cluster#rolling-upgrade" >}}).
+{{< /note >}}
+
+To enable SCH on a Redis Enterprise server, you must use the
+[/v1/cluster]({{< relref "/operate/rs/references/rest-api/requests/cluster#put-cluster" >}})
+REST API request to set the `client_maint_notifications` option to `true`.
+The example below shows how to do this using the
+[`curl`](https://curl.se/) command line utility:
+
+```bash
+curl -k -X PUT -H "accept: application/json" \
+    -H "content-type: application/json" \
+    -u "<username>:<password>" \
+    -d '{ "client_maint_notifications": true }' \
+    https://<host>:<port>/v1/cluster
+```

content/operate/rs/references/rest-api/objects/cluster/_index.md

@@ -19,6 +19,7 @@ An API object that represents the cluster.
 | <span class="break-all">availability_lag_tolerance_ms</span> | integer (default: 100) | The maximum replication lag in milliseconds tolerated between source and replicas during [lag-aware database availability checks]({{<relref "/operate/rs/monitoring/db-availability#lag-aware">}}). |
 | bigstore_driver | "speedb"<br />"rocksdb" | Storage engine for [Redis Flex or Auto Tiering]({{<relref "/operate/rs/databases/flash">}}) |
 | <span class="break-all">cluster_ssh_public_key</span> | string | Cluster's autogenerated SSH public key |
+|  client_maint_notifications | boolean (default: false) | Toggles sending client maintenance notifications about shard movements |
 | cm_port | integer, (range: 1024-65535) | UI HTTPS listening port |
 | <span class="break-all">cm_session_timeout_minutes</span> | integer (default: 15) | The timeout (in minutes) for the session to the CM |
 | <span class="break-all">cnm_http_max_threads_per_worker</span> | integer (default: 10) | Maximum number of threads per worker in the `cnm_http` service (deprecated) |