added no-HA API status error message to EMs page

website/content/docs/nia/api/status.mdx

@@ -232,7 +232,7 @@ Response:
 
 ## Cluster status
 
-The `/v1/status/cluster` API endpoint returns information about the cluster and member instances, such as health status and leadership. This endpoint is only supported when using CTS in [high availability mode](/docs/usage/run-ha). If you call the endpoint without configuring CTS for high availability, then CTS prints an error to the console. Refer to [Error Messages](/docs/nia/usage/errors-ref) for information about CTS error messages. 
+The `/v1/status/cluster` API endpoint returns information about the cluster and member instances, such as health status and leadership. This endpoint is only supported when using CTS in [high availability mode](/docs/nia/usage/run-ha). If you call the endpoint without configuring CTS for high availability, then CTS prints an error to the console. Refer to [Error Messages](/docs/nia/usage/errors-ref) for information about CTS error messages. 
 
 | Method | Path              | Response format    |
 | ------ | ----------------- | ------------------ |

website/content/docs/nia/usage/errors-ref.mdx

@@ -95,3 +95,23 @@ Identify and send the request to the leader CTS instance. You can identify the l
 ```shell-session
 [INFO] ha: acquired leadership lock: id=<ID-OF-CTS-INSTANCE>
 ```
+
+---
+
+**Error**:
+
+```json
+{
+  "error": {
+    "message": "this endpoint is only available with high availability configured"
+  }
+}
+```
+
+**Conditions**:
+
+- CTS is not configured for [high availability](/docs/nia/usage/run-ha).
+
+**Resolution**:
+
+Configure CTS to run in [high availability mode](/docs/nia/usage/run-ha).