How to monitor Fastify app with Prometheus and Grafana? - node.js

Question

I am learning to monitor my Fastify app with Prometheus and Grafana. First, I installed fastify-metrics package and registered in Fastify app.
// app.ts
import metrics from 'fastify-metrics'
...
app.register(metrics, {
endpoint: '/metrics',
})
Then I setup Prometheus and Grafana in docker-compose.yml:
version: "3.7"
services:
prometheus:
image: prom/prometheus:latest
volumes:
- prometheus_data:/prometheus
- ./prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
command:
- '--config.file=/etc/prometheus/prometheus.yml'
network_mode: host
ports:
- '9090:9090'
grafana:
image: grafana/grafana:latest
volumes:
- grafana_data:/var/lib/grafana
# - ./grafana/provisioning:/etc/grafana/provisioning
# - ./grafana/config.ini:/etc/grafana/config.ini
# - ./grafana/dashboards:/var/lib/grafana/dashboards
environment:
- GF_SECURITY_ADMIN_PASSWORD=ohno
depends_on:
- prometheus
network_mode: host
ports:
- '3000:3000'
volumes:
prometheus_data: {}
grafana_data: {}
I added network_mode=host because Fastfy app will be running at localhost:8081.
Here's the Prometheus config:
# prometheus.yml
global:
scrape_interval: 15s
scrape_timeout: 10s
evaluation_interval: 1m
scrape_configs:
- job_name: 'prometheus'
# metrics_path: /metrics
static_configs:
- targets: [
'app:8081',
]
- job_name: 'node_exporter'
static_configs:
- targets: [
'localhost:8081',
]
After docker-compose up and npm run dev, Fastify app is up and running and target localhost:8081 is UP in Prometheus dashboard, localhost:9090, I tried executing some metrics.
I imported Node Exporter Full and Node Exporter Server Metrics dashboards. And added Prometheus datasource localhost:9090, named Fastify, and saved successfully, showed Data source is working.
However, when I go to the Node Exporter Full dashboard, it shows no data. I selected Fastify in datasource but it shows None in others selections at upper left corner.
Please help, what I am doing wrong?

Answer 1

It looks like you're using a dashboard intended for linux stats. In order to use Prometheus/Grafana with your Fastify app, you'll need a dashboard that's meant for Node.js apps. For example:
https://grafana.com/grafana/dashboards/11159
https://grafana.com/grafana/dashboards/12230
Plugging one of those in should do the trick.

Answer 2

you should specify the metrics_path in the job as defined in your 'fastify-metrics' endpoint and also update the targets param:
- job_name: 'node_exporter'
scrape_interval: 5s
metrics_path: /metrics
scheme: http
static_configs:
- targets: ['localhost:8081']
labels:
group: 'node_exporter'