NodeJS

Setup

The Prometheus NodeJS Exporter needs to be set up. For e.g.

const client = require('prom-client');
const collectDefaultMetrics = client.collectDefaultMetrics;
const Registry = client.Registry;
const register = new Registry();
collectDefaultMetrics({ register })

Metrics and Key Performance Indicators (KPIs)

Metric	KPI
Memory process_resident_memory_bytes	Utilization in k8s process_resident_memory_bytes / kube_node_status_allocatable{resource="memory"} Utilization in non k8s process_resident_memory_bytes / node_memory_MemTotal_bytes
CPU process_cpu_seconds_total	Utilization in k8s rate(process_cpu_seconds_total[5m]) / kube_pod_container_resource_limits{resource="cpu"} Utilization in non k8s rate(process_cpu_seconds_total[5m]) / rate(node_cpu_seconds_total[5m])

Dashboard

In addition to the above KPIs, the following NodeJS runtime metrics are visualized in the KPI Dashboard

Heap Usage

• nodejs_heap_size_total_bytes

• nodejs_heap_size_used_bytes

• nodejs_heap_space_size_used_bytes

Event loop Latency

• nodejs_eventloop_lag_seconds

• nodejs_eventloop_lag_p99_seconds

GC Duration and Count

• rate(nodejs_gc_duration_seconds_sum[5m])

• rate(nodejs_gc_duration_seconds_count[5m])

Active Handles and Requests

• nodejs_active_handles_total

• nodejs_active_reqeuests_total

File Handles

• process_open_fds

• process_max_fds

Dashboard