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docs-2.0/nebula-dashboard-ent/4.cluster-operator/1.overview.md
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| # Cluster overview | ||
| # Cluster Overview | ||
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| This topic introduces the **Overview** page of Dashboard. | ||
| This topic introduces the **Cluster Overview** page of Dashboard, which contains the following parts: | ||
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| - **Info Overview** | ||
| - **Cluster Topology** | ||
| - **Monitoring Screen** | ||
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| ## Entry | ||
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| 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. | ||
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| ## Overview | ||
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| The **Overview** page has the following parts: | ||
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| - Cluster key information | ||
| - Cluster topology | ||
| - Node monitoring | ||
| - Service monitoring | ||
| ## Info Overview | ||
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| ### Cluster key information | ||
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| In the cluster key information, the following information is displayed. | ||
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| - 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. | ||
| - 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 on the **Cluster Diagnosis** page. | ||
| - Monitoring nodes and services: Display the number of online nodes/total nodes and the number of online services/total services. Different types of services are displayed separately. Click on  to access the [Service](./operator/service.md) page. | ||
| - Number of slow queries (5min): The number of slow queries in the cluster in the last 5 minutes. | ||
| - Newly created sessions (5min): The number of newly created sessions in the cluster in the last 5 minutes. | ||
| - Latest backup time: The latest backup time of the cluster. Click on  to access the [Backup and Restore](./operator/backup-and-restore.md) page. | ||
| - Total storage usage: The total storage usage of the cluster. Click on  to display more details. | ||
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| ### Cluster monitoring panel | ||
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| In the cluster monitoring panel, users can select and view monitoring data from different periods. Users can either select a custom time range or choose from predefined time ranges such as the last 5 minutes, 1 hour, 6 hours, 12 hours, 1 day, and 3 days. The monitoring panel displays the following information: | ||
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| - QPS: The time-series diagram of the QPS. | ||
| - Query latency: The time-series diagram of the query latency. | ||
| - Query latency(P95): The time-series diagram of the query latency. | ||
| - CPU usage: The CPU usage of the cluster. | ||
| - Memory Utilization: The memory utilization of the cluster. | ||
| - Opened sessions: The total number of sessions created in the cluster. | ||
| - Slow Query: The number of slow queries in the cluster. | ||
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| Users can click  to jump to the detailed service monitoring panel page. | ||
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| ## Cluster topology | ||
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| Shows the distribution and status of nodes and services in the cluster. Click **Cluster Topology** at the top of the page to enter the Cluster Topology page. | ||
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| ## Monitoring screen | ||
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| The monitoring screen helps users understand the health status of the cluster and the information on services and nodes at a glance. | ||
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| Click **Switch to Monitoring Screen** to enter the monitoring screen page. | ||
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| ### Cluster topology | ||
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| Shows the distribution and status of nodes and services in the cluster. | ||
| | Screen area | Information displayed | | ||
| | ------------ | ------------------------------------------------------------ | | ||
| | Upper middle area | 1. The health degree of your cluster. The system scores the health of your cluster. For more information, see the following note. <br>2. The information and number of running nodes, the number of running services and abnormal services in the cluster. <br/>3. CPU and memory usage of the node at the current time.<br/>4. Alert notifications. The system displays the 5 most recently triggered alert messages based on their severity level (emergency>critical>warning). For more information, [Monitoring alerts](../4.cluster-operator/9.notification.md). | | ||
| | Lower middle area | Monitoring information of 4 Graph service metrics at different periods. The 4 metrics are: <br/>1. num_active_sessions<br/>2. num_slow_queries<br/>3. num_active_queries<br/>4. num_query_errors | | ||
| | Left side of the area | 1. QPS (Query Per Second) of your cluster.<br/>2. The monitoring information of 2 Storage service metrics at different periods. The two metrics are: add_edges_latency_us,add_vertices_latency_us. | | ||
| | Right side of the area | The node-related metrics information at different periods. Metrics include: <br/>1. cpu_utilization<br/>2. memory_utilization<br/>3. load_1m<br/>4. disk_readbytes<br/>5. disk_writebytes | | ||
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| ### Node monitoring | ||
| For more information about the monitoring metrics, see [Metrics](../7.monitor-parameter.md). | ||
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| - You can view the information of node monitoring quickly, and add or delete monitoring metrics. | ||
| - You can click  on the page to insert a base line. | ||
| - You can click  to jump to the detailed node monitoring page. | ||
| !!! note | ||
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| ### Service monitoring | ||
| Cluster scoring rules are as follows: | ||
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| - You can view the information of service monitoring quickly, and add or delete monitoring metrics. | ||
| - You can click  **Set up** to insert a base line. | ||
| - You can click  **View** to jump to the detailed service monitoring page. | ||
| - The maximum score is 100; The minimum score is 13. | ||
| - When 100≥Health Degree≥80, the score is blue; When 80＞Health Degree≥60, the score is yellow; When Health Degree＜60, the score is yellow. | ||
| - Algorithm: (1-number of abnormal services/total number of services)*100%. | ||
| - Except for the appearance of the first `emergency` level alert that deducts 40 points, 10 points are deducted for each of the other `emergency` level alerts and other levels of alerts. |
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