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69 lines
2.5 KiB
Markdown
69 lines
2.5 KiB
Markdown
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## Victoria Metrics Cluster Per Tenant Statistic
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<img alt="cluster-per-tenant-stat" src="per-tenant-stats.jpg">
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Enterprise version of Victoria Metrics Cluster exposes usage statistic for each tenant.
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The next statistic is exposed:
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- `vminsert`
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* `vm_tenant_inserted_rows_total` - the ingestion rate by tenant
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- `vmselect`
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* `vm_tenant_select_requests_duration_ms_total` - query latency by tenant. It can be usefull for identifing tenant with the most heaviest queries
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* `vm_tenant_select_requests_total` - total requests. You can calculate request rate (qps) by using this metric
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- `vmstorage`
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* `vm_tenant_active_timeseries` - the number of active timeseries
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* `vm_tenant_used_tenant_bytes` - the disk spaces is consumed by metrics for particular tenant
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* `vm_tenant_timeseries_created_total` - the total number for timeseries by tenant
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The information should be scrapped by the agent (`vmagent`, `victoriametrics`, prometheus, etc) and stored in TSDB. This can be the same cluster but a different tenant, but we encourage to use one more instance of TSDB (more lightweight, eg. VM single) for monitoring of monitoring.
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the config example for statistic scrapping
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```yaml
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scrape_configs:
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- job_name: cluster
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scrape_interval: 10s
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static_configs:
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- targets: ['vmselect:8481','vmstorage:8482','vminsert:8480']
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```
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### Visualization
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Visualisation of statistic can be done in grafana using this dashboard [link](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster/dashboards/clusterbytenant.json)
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### Integration with vmgateway:
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Per Tenant Statistic is the source data for `vmgateway` rate limiter. More information can be found [here](https://victoriametrics.github.io/vmgateway.html)
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### Integration with vmalert:
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You can generate alerts based on each tenant resource usage and notify the system/people about reaching the limits.
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here is an example of alert by high churn rate by the tenant
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```yaml
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- alert: TooHighChurnRate
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expr: |
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(
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sum(rate(vm_tenant_timeseries_created_total[5m])) by(accountID,projectID)
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/
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sum(rate(vm_tenant_inserted_rows_total[5m])) by(accountID,projectID)
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) > 0.1
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for: 15m
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labels:
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severity: warning
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annotations:
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summary: "Churn rate is more than 10% for the last 15m"
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description: "VM constantly creates new time series at tenant: {{ $labels.accountID }}:{{ $labels.projectID }}.\n
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This effect is known as Churn Rate.\n
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High Churn Rate tightly connected with database performance and may
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result in unexpected OOM's or slow queries."
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```
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