Metrics¶
This topic will describe the monitoring metrics in NebulaGraph 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 (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_percentage |
The disk utilization percentage. |
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. |
Note
Dashboard collects the following metrics from the NebulaGraph core, but only shows the metrics that are important to it.
Graph¶
| Parameter | Description |
|---|---|
num_active_queries |
The number of changes in the number of active queries. Formula: The number of started queries minus the number of finished queries within a specified time. |
num_active_sessions |
The number of changes in the number of active sessions. Formula: The number of logged in sessions minus the number of logged out sessions within a specified time. For example, when querying num_active_sessions.sum.5, if there were 10 sessions logged in and 30 sessions logged out in the last 5 seconds, the value of this metric is -20 (10-30). |
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_out_of_max_allowed |
The number of sessions that failed to authenticate logins because the value of the parameter FLAG_OUT_OF_MAX_ALLOWED_CONNECTIONS was exceeded. |
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 sent 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 latency of queries. |
slow_query_latency_us |
The latency of slow queries. |
num_queries_hit_memory_watermark |
The number of queries reached the memory watermark. |
resp_part_completeness |
The completeness of the partial success. You need to set accept_partial_success to true in the graph configuration first. |
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. |
num_agent_heartbeats |
The number of heartbeats for the AgentHBProcessor. |
agent_heartbeat_latency_us |
The latency of the AgentHBProcessor. |
replicate_log_latency_us |
The latency of replicating the log record to most nodes by Raft. |
num_send_snapshot |
The number of times that Raft sends snapshots to other nodes. |
append_log_latency_us |
The latency of replicating the log record to a single node by Raft. |
append_wal_latency_us |
The Raft write latency for a single WAL. |
num_grant_votes |
The number of times that Raft votes for other nodes. |
num_start_elect |
The number of times that Raft starts an election. |
Storage¶
| Parameter | Description |
|---|---|
add_edges_latency_us |
The latency of adding edges. |
add_vertices_latency_us |
The 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 latency of deleting edges. |
delete_vertices_latency_us |
The latency of deleting vertices. |
get_neighbors_latency_us |
The latency of querying neighbor vertices. |
get_dst_by_src_latency_us |
The latency of querying the destination vertex by the source vertex. |
num_get_prop |
The number of executions for the GetPropProcessor. |
num_get_neighbors_errors |
The number of execution errors for the GetNeighborsProcessor. |
num_get_dst_by_src_errors |
The number of execution errors for the GetDstBySrcProcessor. |
get_prop_latency_us |
The latency of executions for the GetPropProcessor. |
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. |
lookup_latency_us |
The latency of executions for the LookupProcessor. |
num_lookup_errors |
The number of execution errors for the LookupProcessor. |
num_scan_vertex |
The number of executions for the ScanVertexProcessor. |
num_scan_vertex_errors |
The number of execution errors for the ScanVertexProcessor. |
update_edge_latency_us |
The latency of executions for the UpdateEdgeProcessor. |
num_update_vertex |
The number of executions for the UpdateVertexProcessor. |
num_update_vertex_errors |
The number of execution errors for the UpdateVertexProcessor. |
kv_get_latency_us |
The latency of executions for the Getprocessor. |
kv_put_latency_us |
The latency of executions for the PutProcessor. |
kv_remove_latency_us |
The latency of executions for the RemoveProcessor. |
num_kv_get_errors |
The number of execution errors for the GetProcessor. |
num_kv_get |
The number of executions for the GetProcessor. |
num_kv_put_errors |
The number of execution errors for the PutProcessor. |
num_kv_put |
The number of executions for the PutProcessor. |
num_kv_remove_errors |
The number of execution errors for the RemoveProcessor. |
num_kv_remove |
The number of executions for the RemoveProcessor. |
forward_tranx_latency_us |
The latency of transmission. |
scan_edge_latency_us |
The latency of executions for the ScanEdgeProcessor. |
num_scan_edge_errors |
The number of execution errors for the ScanEdgeProcessor. |
num_scan_edge |
The number of executions for the ScanEdgeProcessor. |
scan_vertex_latency_us |
The latency of executions for the ScanVertexProcessor. |
num_add_edges |
The number of times that edges are added. |
num_add_edges_errors |
The number of errors when adding edges. |
num_add_vertices |
The number of times that vertices are added. |
num_start_elect |
The number of times that Raft starts an election. |
num_add_vertices_errors |
The number of errors when adding vertices. |
num_delete_vertices_errors |
The number of errors when deleting vertices. |
append_log_latency_us |
The latency of replicating the log record to a single node by Raft. |
num_grant_votes |
The number of times that Raft votes for other nodes. |
replicate_log_latency_us |
The latency of replicating the log record to most nodes by Raft. |
num_delete_tags |
The number of times that tags are deleted. |
num_delete_tags_errors |
The number of errors when deleting tags. |
num_delete_edges |
The number of edge deletions. |
num_delete_edges_errors |
The number of errors when deleting edges |
num_send_snapshot |
The number of times that snapshots are sent. |
update_vertex_latency_us |
The latency of executions for the UpdateVertexProcessor. |
append_wal_latency_us |
The Raft write latency for a single WAL. |
num_update_edge |
The number of executions for the UpdateEdgeProcessor. |
delete_tags_latency_us |
The latency of deleting tags. |
num_update_edge_errors |
The number of execution errors for the UpdateEdgeProcessor. |
num_get_neighbors |
The number of executions for the GetNeighborsProcessor. |
num_get_dst_by_src |
The number of executions for the GetDstBySrcProcessor. |
num_get_prop_errors |
The number of execution errors for the GetPropProcessor. |
num_delete_vertices |
The number of times that vertices are deleted. |
num_lookup |
The number of executions for the LookupProcessor. |
num_sync_data |
The number of times the Storage service synchronizes data from the Drainer. |
num_sync_data_errors |
The number of errors that occur when the Storage service synchronizes data from the Drainer. |
sync_data_latency_us |
The latency of the Storage service synchronizing data from the Drainer. |
Graph space¶
Note
Space-level metrics are created dynamically, so that only when the behavior is triggered in the graph space, the corresponding metric is created and can be queried by the user.
| Parameter | Description |
|---|---|
num_active_queries |
The number of queries currently being executed. |
num_queries |
The number of queries. |
num_sentences |
The number of statements received by the Graphd service. |
optimizer_latency_us |
The latency of executing optimizer statements. |
query_latency_us |
The latency of queries. |
num_slow_queries |
The number of slow queries. |
num_query_errors |
The number of query errors. |
num_query_errors_leader_changes |
The number of raft leader changes due to query errors. |
num_killed_queries |
The number of killed queries. |
num_aggregate_executors |
The number of executions for the Aggregation operator. |
num_sort_executors |
The number of executions for the Sort operator. |
num_indexscan_executors |
The number of executions for index scan operators. |
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_opened_sessions |
The number of sessions connected to the server. |
num_queries_hit_memory_watermark |
The number of queries reached the memory watermark. |
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 sent 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. |
slow_query_latency_us |
The latency of slow queries. |
Last update:
October 20, 2022