add what is dashboard ent

docs-2.0/nebula-dashboard-en/1.what-is-dashboard-en.md

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+# What is Nebula Dashboard Enterprise Edition
+
+Nebula Dashboard Enterprise Edition (Dashboard for short) is a visualization tool that monitors and manages the status of machines and services in Nebula Graph clusters. This topic introduces Dashboard Enterprise Edition. For more information, see [What is Nebula Dashboard Community Edition](../nebula-dashboard/1.what-is-dashboard.md).
+
+## Features
+
+- Create a Nebula Graph cluster of a specified version, import nodes in batch, scale out Nebula Graph services with one click
+
+- Import clusters, balance data, scale out or in through visualization interface.
+
+- Manage clusters, and audit operation log of clusters within the last 14 days.
+
+- Start, stop and restart services through visualization interface.
+
+- Update the configuration of Storage services and Graph services in clusters quickly.
+
+- Monitor the information of all the services in clusters, including the IP address, version, and monitoring metrics (such as the number of queries, the latency of queries, the latency of heartbeats).
+
+- Monitor the status of all the machines in clusters, including CPU, memory, load, disk, and network.
+
+- Monitor the information of clusters, including the information of services, partitions, configurations, and long-term tasks.
+
+## Scenarios
+
+- You want a visualized operation and maintenance monitoring platform for large-scale clusters.
+
+- You want to monitor key metrics conveniently and quickly, and present multiple key information of the business to ensure that the business can be operated normally.
+
+- You want to monitor clusters from multiple dimensions (such as the time, aggregate rules, and metrics).
+
+- You want to review it and confirm its occurrence time and unexpected phenomena after a failure occurs.
+
+## Precautions
+
+- The monitoring data will be updated per 7 seconds by default.
+
+- The monitoring data will be retained for 14 days by default, that is, only the monitoring data within the last 14 days can be queried.
+
+- The version of Nebula Graph must be 2.0.1 or later.
+
+- It's recommend to use the latest version of Chrome to access Dashboard.
+
+- It's recommend to use the official installation package to create or import clusters.
+
+!!! note
+
+    The monitoring feature is supported by Prometheus. The update frequency and retention intervals can be modified. For details, see [Prometheus](https://prometheus.io/docs/prometheus/latest/configuration/configuration/).