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 in Disk and Network is byte. The unit will change 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.
- For versions of Dashboard Community Edition greater than v1.0.2, 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_active_queries | The number of queries currently being executed. |
| num_active_sessions | The number of currently active sessions. |
| num_aggregate_executors | The number of executions for the Aggregation operator. |
| num_auth_failed_sessions_bad_username_password | The number of sessions where authentication failed due to incorrect username and password. |
| num_auth_failed_sessions | The number of sessions in which login authentication failed. |
| num_indexscan_executors | The number of executions for index scan operators. |
| num_killed_queries | The number of killed queries. |
| num_opened_sessions | The number of sessions connected to the server. |
| num_queries | The number of queries. |
| num_query_errors_leader_changes | The number of the raft leader changes due to query errors. |
| num_query_errors | The number of query errors. |
| num_reclaimed_expired_sessions | The number of expired sessions actively reclaimed by the server. |
| num_rpc_sent_to_metad_failed | The number of failed RPC requests that the Graphd service sends to the Metad service. |
| num_rpc_sent_to_metad | The number of RPC requests that the Graphd service sent to the Metad service. |
| num_rpc_sent_to_storaged_failed | The number of failed RPC requests that the Graphd service sent to the Storaged service. |
| num_rpc_sent_to_storaged | The number of RPC requests that the Graphd service sent to the Storaged service. |
| num_sentences | The number of statements received by the Graphd service. |
| num_slow_queries | The number of slow queries. |
| num_sort_executors | The number of executions for the Sort operator. |
| optimizer_latency_us | The latency of executing optimizer statements. |
| query_latency_us | The average latency of queries. |
| slow_query_latency_us | The average latency of slow queries. |
Meta¶
| Parameter | Description |
|---|---|
| commit_log_latency_us | The latency of committing logs in Raft. |
| commit_snapshot_latency_us | The latency of committing snapshots in Raft. |
| heartbeat_latency_us | The latency of heartbeats. |
| num_heartbeats | The number of heartbeats. |
| num_raft_votes | The number of votes in Raft. |
| transfer_leader_latency_us | The latency of transferring the raft leader. |
Storage¶
| Parameter | Description |
|---|---|
| add_edges_latency_us | The average latency of adding edges. |
| add_vertices_latency_us | The average latency of adding vertices. |
| commit_log_latency_us | The latency of committing logs in Raft. |
| commit_snapshot_latency_us | The latency of committing snapshots in Raft. |
| 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 neighbor vertices. |
| num_edges_deleted | The number of deleted edges. |
| num_edges_inserted | The number of inserted edges. |
| num_raft_votes | The number of votes in Raft. |
| num_rpc_sent_to_metad_failed | The number of failed RPC requests that the Storage service sent to the Meta service. |
| num_rpc_sent_to_metad | The number of RPC requests that the Storaged service sent to the Metad service. |
| num_tags_deleted | The number of deleted tags. |
| num_vertices_deleted | The number of deleted vertices. |
| num_vertices_inserted | The number of inserted vertices. |
| transfer_leader_latency_us | The latency of transferring the raft leader. |
Graph space¶
| Parameter | Description |
|---|---|
| num_active_queries | The number of queries currently being executed. |
| num_aggregate_executors | The number of executions for the Aggregation operator. |
| num_indexscan_executors | The number of executions for index scan operators. |
| num_killed_queries | The number of killed queries. |
| num_queries | The number of queries. |
| num_query_errors_leader_changes | The number of raft leader changes due to query errors. |
| num_query_errors | The number of query errors. |
| num_sentences | The number of statements received by the Graphd service. |
| num_slow_queries | The number of slow queries. |
| num_sort_executors | The number of executions for the Sort operator. |
| optimizer_latency_us | The latency of executing optimizer statements. |
| query_latency_us | The average latency of queries. |
Last update:
January 17, 2022