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Configure Loopback to generate Prometheus metrics
To configure Loopback to generate Prometheus metrics, complete the following steps:
Run the following commands:
Install -------- npm install --save @loopback/metrics Import -------- import {MetricsComponent} from '@loopback/metrics';In the constructor, add the following component to your application:
this.component(MetricsComponent);For more information about additional configuration changes, refer to loopback-metrics.
Verify the presence of the following metrics in Prometheus:
- loopback_invocation_total
- loopback_invocation_duration_seconds
Metrics
| Metric | KPI |
|---|---|
Requests loopback_invocation_total | Request Rate rate(loopback_invocation_total[5m]) |
Errors loopback_invocation_total | Error Ratio (server errors) rate(loopback_invocation_total{status= Error Ratio (client errors) rate(loopback_invocation_total{statusCode=“4..”}[5m])/ rate(loopback_invocation_total[5m]) |
Latency loopback_invocation_duration_seconds | Latency Average rate(loopback_invocation_duration_seconds[5m])/ rate(loopback_invocation_total[5m]) Latency P99 histogram_quantile ( |
Alerts
| KPI | Alerts |
|---|---|
| Request Rate | RequestRateAnomaly |
| Error Rate | ErrorRatioBreach ErrorBuildup based on a 99.9 SLO |
Latency Average Latency P99 | LatencyAverageBreach LatencyAverageAnomaly LatencyP99ErrorBuildup |
Service KPI dashboard
This dashboard has the following KPIs from resources and requests:
- Request Rate
- Latency Average
- Latency P99
- Error Rate
- CPU %
- CPU Cores Used
- CPU Throttle
- Memory %
- Memory Bytes
- Disk Usage
- Network Usage

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