Loopback

Setup

You can follow the below steps to enable Prometheus metrics for Loopback

Install
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npm install --save @loopback/metrics

Import
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import {MetricsComponent} from '@loopback/metrics';

In the constructor, add the component to your application:
----
this.component(MetricsComponent);

You can refer the Link for any further config changes or information

You can verify the loopback is enabled by checking following metrics

• 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="5.."}[5m])/ rate(loopback_invocation_total[5m]) 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 ( 0.99, sum(rate(loopback_invocation_duration_histogram_bucket[1m]) > 0) by (le) )

Alerts

KPI	Alerts
Request Rate	RequestRateAnomaly
Error Rate	ErrorRatioBreach ErrorBuildup based on a 99.9 SLO
Latency Average Latency P99	LatencyAverageBreach LatencyAverageAnomaly LatencyP99ErrorBuildup

Dashboards

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