add faq for dashboard-ent (#1138)

docs-2.0/nebula-dashboard-ent/4.cluster-operator/2.monitor.md

@@ -41,4 +41,6 @@ On this page, you can view the information of Graph, Meta, and Storage services
 
  Space graph metrics record the information of different graph spaces separately. Currently, only the Graph service supports a set of space-level metrics.
 
-Only when the behavior of a graph space metric is triggered, you can specify the graph space to view information about the corresponding graph space metric. For information about the space graph metrics, see [Space graph](../7.monitor-parameter.md).
+Only when the behavior of a graph space metric is triggered, you can specify the graph space to view information about the corresponding graph space metric. For information about the space graph metrics, see [Space graph](../7.monitor-parameter.md).
+
+![](../figs/space_level_metrics.png)

docs-2.0/nebula-dashboard-ent/8.faq.md

@@ -51,3 +51,12 @@ You can also execute `cat logs/webserver.log` in the Dashboard directory to view
 ## "Can I add the Nebula Graph installation package manually?"
 
 You can add the installation package manually in Dashboard. To download the system and RPM/DEB package you need, see [How to download Nebula Graph](https://nebula-graph.io/download/) and add the package to `dashboard/download/nebula-graph`. And you can select the added package for deployment when creating and scaling out a cluster.
+
+## Why do I get "Permission Denied" when importing a cluster?
+
+When importing a cluster, you need to access the path where the Nebula Graph services are installed. If the service account does not have access privileges, the cluster cannot be imported successfully. You can grant access to the service to the account (e.g. `sudo chown -R tom:tom nebula`) and restart the service with the account. 
+## Why does it prompt “SSH connection error” when importing a cluster？
+
+If **Service Host** shows `127.0.0.1`, and your Dashboard and Nebula Graph are deployed on the same machine when authorizing service hosts, the system will prompt "SSH connection error”. You need to change the Host IP of each service to the real machine IP in the configuration files of all Nebula Graph services. For more information, see [Configuration management](../5.configurations-and-logs/1.configurations/1.configurations.md).
+
+If you import a cluster deployed with Docker, it also prompts "SSH connection error". Dashboard does not support importing a cluster deployed with Docker.