optimize overview page

docs-2.0/nebula-dashboard-ent/4.cluster-operator/1.overview.md

@@ -1,71 +1,50 @@
 # Cluster overview
 
-This topic introduces the **Overview** page of Dashboard. 
+This topic introduces the **Overview** page of Dashboard.
 
-At the top of the Dashboard page, click **Cluster Management**, and then click **Detail** on the right of the cluster management page to check the overview of a specified cluster.
+## Entry
+
+1. At the top navigation bar of the Dashboard Enterprise Edition page, click **Cluster Management**.
+2. Click **Detail** on the right of the cluster management page to check the overview of a specified cluster.
 
 ## Overview
 
 The **Overview** page has the following parts:
 
-- Cluster survey
-- Alert
-- Information
-- Node
-- Status list
-- Service
-
-### Cluster survey
-
-In this part, you can view the number of nodes as well as the number of running and abnormal services of Graphd, Storaged, and Metad. You can click the **View** button to quickly check the abnormal service and node.
-
-### Alert
-
-In the **Alert** section, the system displays the five most recently triggered alert messages according to their severity levels (`emergency`>`critical`>`warning`). 
-
-In the right upper corner, click **Alert Messages** to view alert messages. For more information about alerts, see [Alerts](../4.cluster-operator/9.notification.md).
-
-### Information
-
-In this part, you can view the information of **Cluster Name**, **Creation Time**, **Expiration Time**, **Creator**, and **Version**.
+- Cluster key information
+- Cluster topology
+- Node monitoring
+- Service monitoring
 
-- **Cluster Name**：The name of the cluster.
-- **Creation Time**：The time when the cluster is created.
-- **Expiration Time**：The time when the cluster license expires.
+### Cluster key information
 
-  !!! enterpriseonly
+In the cluster key information, the following information is displayed.
 
-        The parameter **Expiration Time** is displayed only if the created or imported cluster is an Enterprise Edition cluster.
+- Cluster health score: Displays the health of the cluster on a percentage basis. It is refreshed every 5 minutes, or immediately if there is an emergency level alarm. The calculation formula can be configured in the **Cluster Diagnostics** page.
+- Monitoring nodes: Shows the number of online nodes/total number of nodes.
+- Monitoring services: Shows the number of online services/total number of services. Different types of services are displayed separately.
+- Cluster information: Displays the cluster name, create time, creator, version, owner, and version upgrade portal.
+- Creation time: The total running time of the cluster.
+- Service online ratio: The ratio of the cluster is in an available state. The calculation formula can be configured in the **Cluster Diagnostics** page.
+- Slow queries: The number of slow queries in the cluster.
+- Max QPS: The maximum QPS in the cluster.
+- Max query latency: The maximum query latency in the cluster.
+- Opened sessions: The total number of sessions created in the cluster.
+- QPS: The time-series diagram of the QPS.
+- Query latency: The time-series diagram of the query latency.
 
-- **Creator**：The Dashboard account that is used to create the cluster.
-- **Version**：The version of NebulaGraph installed in the cluster. The **Version Upgrade** button is displayed on the right to go to the page of [version upgrade](operator/version-upgrade.md).
+### Cluster topology
 
-In the upper right of the **Information** section, click ![watch](https://docs-cdn.nebula-graph.com.cn/figures/watch.png) to view the cluster details, including name, creation time, account name, version, and the role of the account name.
+Shows the distribution and status of nodes and services in the cluster.
 
-{{ ent.ent_begin }}
-!!! enterpriseonly
+### Node monitoring
 
-    For Enterprise Edition, there is a **License** section.
-
-    - Displays the license details of the cluster, including the usage status, the organization, the creation time, the expiration time, the cluster versions supported by the license, and the license type.
-
-    - Supports uploading new licenses. **When the license expires, you cannot perform operations on the current cluster.** Click **Upload License** to upload a new license.
-{{ ent.ent_end }}
-
-### Node
-
-- You can view the information of node monitoring quickly and change the displayed information. By default, the CPU information will be shown.
+- You can view the information of node monitoring quickly, and add or delete monitoring metrics.
 - You can click ![setup](https://docs-cdn.nebula-graph.com.cn/figures/Setup.png) on the page to insert a base line.
 - You can click ![watch](https://docs-cdn.nebula-graph.com.cn/figures/watch.png) to jump to the detailed node monitoring page.
 
-### Status list
-
-This part uses pie charts to visually display the running status of nodes.
-
-### Service
-
-- By default, the information of `query_latency_us` and `slow_query_latency_us` will be shown.
+### Service monitoring
 
+- You can view the information of service monitoring quickly, and add or delete monitoring metrics.
 - You can click ![setup](https://docs-cdn.nebula-graph.com.cn/figures/Setup.png) **Set up** to insert a base line.
-
 - You can click ![watch](https://docs-cdn.nebula-graph.com.cn/figures/watch.png) **View** to jump to the detailed service monitoring page.