Metrics¶

This topic will describe the monitoring metrics in Nebula Dashboard.

Machine¶

Note

All the machine metrics listed below are for the Linux operating system.
The default unit for Disk and Network is byte. The unit changes with the data magnitude as the page displays. For example, when the flow is less than 1 KB/s, the unit is Bytes/s.
For all versions of Dashboard Enterprise Edition, the memory occupied by Buff and Cache will not be counted in the memory usage.

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.

Last update: December 31, 2021