settings and parameters (#894) (#899)

* settings and parameters

* add pics

* fix title

* Update 6.system-settings.md

* Update 7.monitor-parameter.md

docs-2.0/nebula-dashboard-ent/6.system-settings.md

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+# System settings
+
+This topic introduces the system settings that may be applied when using Dashboard.
+
+## Interface settings
+
+On the **Interface settings** page, you can:
+
+- Change the title, upload the logo, and upload the cover.
+- Switch the interface language, which supports English and Chinese for now.
+- Enable or disable the tip settings.
+
+![settings](../nebula-dashboard-ent/figs/ds-033.png)
+
+## Help
+
+On the **Help** page, you can jump to Dashboard Docs, Nebula Graph Docs, Nebula Graph Website, or Nebula Graph Forum.
+
+![help](../nebula-dashboard-ent/figs/ds-034.png)
+
+## User information
+
+On the **User information** page, you can change your password or log out.
+
+![information](../nebula-dashboard-ent/figs/ds-035.png)

docs-2.0/nebula-dashboard-ent/7.monitor-parameter.md

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+# Metrics
+
+This topic will describe the monitoring metrics in Nebula Dashboard.
+
+!!! note
+
+    The default unit in **Disk** and **Network** is byte. The unit will be changed with the data magnitude as the page displays. For example, when the flow is less than 1 KB/s, the unit will be Bytes/s.
+
+## Machine
+
+### CPU
+
+|Parameter|Description|
+|:---|:---|
+|`cpu_utilization`| The percentage of used CPU. |
+|`cpu_idle`| The percentage of idled CPU. |
+|`cpu_wait`| The percentage of CPU waiting for IO operations. |
+|`cpu_user`| The percentage of CPU used by users. |
+|`cpu_system`| The percentage of CPU used by the system. |
+
+### Memory
+
+|Parameter| Description|
+|:---|:---|
+|`memory_utilization`| The percentage of used memory. |
+|`memory_used`| The memory space used (including caches). |
+|`memory_actual_used`| The memory space used (not including caches). |
+|`memory_free`| The memory space available. |
+
+### Load
+
+|Parameter| Description|
+|:---|:---|
+|`load_1m`| The average load of the system in the last 1 minute. |
+|`load_5m`| The average load of the system in the last 5 minutes. |
+|`load_15m`| The average load of the system in the last 15 minutes. |
+
+### Disk
+
+|Parameter| Description|
+|:---|:---|
+|`disk_used`| The disk space used. |
+|`disk_free`| The disk space available. |
+|`disk_readbytes`| The number of bytes that the system reads in the disk per second. |
+|`disk_writebytes`| The number of bytes that the system writes in the disk per second. |
+|`disk_readiops`| The number of read queries that the disk receives per second. |
+|`disk_writeiops`| The number of write queries that the disk receives per second. |
+|`inode_utilization`| The percentage of used inode. |
+
+### Network
+
+|Parameter| Description|
+|:---|:---|
+|`network_in_rate`| The number of bytes that the network card receives per second. |
+|`network_out_rate`| The number of bytes that the network card sends out per second. |
+|`network_in_errs`| The number of wrong bytes that the network card receives per second. |
+|`network_out_errs`| The number of wrong bytes that the network card sends out per second. |
+|`network_in_packets`| The number of data packages that the network card receives per second. |
+|`network_out_packets`| The number of data packages that the network card sends out per second. |
+
+## Service
+
+### Period
+
+The period is the time range of counting metrics. It currently supports 5 seconds, 60 seconds, 600 seconds, and 3600 seconds, which respectively represent the last 5 seconds, the last 1 minute, the last 10 minutes, and the last 1 hour.
+
+### Metric methods
+
+|Parameter|Description|
+|:---|:---|
+|`rate`| The average rate of operations per second in a period. |
+|`sum`| The sum of operations in the period. |
+|`avg`| The average latency in the cycle. |
+|`P75`| The 75th percentile latency. |
+|`P95`| The 95th percentile latency. |
+|`P99`| The 99th percentile latency. |
+|`P999`| The 99.9th percentile latency. |
+
+### Graph
+
+|Parameter| Description|
+|:---|:---|
+|`num_queries`| The number of queries. |
+|`num_slow_queries`| The number of slow queries. |
+|`query_latency_us`| The average latency of queries. |
+|`slow_query_latency_us`| The average latency of slow queries. |
+|`num_query_errors`| The number of queries in error. |
+
+### Meta
+
+|Parameter| Description|
+|:---|:---|
+|`heartbeat_latency_us`| The latency of heartbeats. |
+|`num_heartbeats`| The number of heartbeats. |
+
+### Storage
+
+|Parameter| Description|
+|:---|:---|
+|`add_edges_latency_us`| The average latency of adding edges. |
+|`add_vertices_latency_us`| The average latency of adding vertices. |
+|`delete_edges_latency_us`| The average latency of deleting edges. |
+|`delete_vertices_latency_us`| The average latency of deleting vertices. |
+|`get_neighbors_latency_us`| The average latency of querying neighbors. |