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@selinarnd/nest-prom

1.1.1 • Public • Published

@selinarnd/nest-prom

A Prometheus module for Nest.

Installation

$ yarn add --save @selinarnd/nest-prom prom-client

How to use

Import PromModule into the root ApplicationModule:

import { Module } from "@nestjs/common";
import { PromModule } from "@selinarnd/nest-prom";
 
@Module({
  imports: [
    PromModule.forRoot({
      defaultLabels: {
        app: 'my_app',
      },
    }),
  ],
})
export class ApplicationModule {}

Setup metric

In your module, use the forMetrics() method to define the metrics needed.

import { Module } from "@nestjs/common";
import { PromModule, MetricType } from "@selinarnd/nest-prom";
 
@Module({
  imports: [
    PromModule.forMetrics([
      {
        type: MetricType.Counter,
        configuration: {
          name: 'my_counter',
          help: 'my_counter a simple counter',
        },
      },
      {
        type: MetricType.Gauge,
        configuration: {
          name: 'my_gauge',
          help: 'my_gauge a simple gauge',
        },
      },
      {
        type: MetricType.Histogram,
        configuration: {
          name: 'my_histogram',
          help: 'my_histogram a simple histogram',
        },
      },
      {
        type: MetricType.Summary,
        configuration: {
          name: 'my_summary',
          help: 'my_summary a simple summary',
        },
      },
    ]),
  ],
})
export class MyModule {}

And you can use @InjectCounterMetric() decorator to get the metrics:

import { Injectable } from "@nestjs/common";
import {
  InjectCounterMetric,
  InjectGaugeMetric,
  InjectHistogramMetric,
  InjectSummaryMetric,
  CounterMetric,
  GaugeMetric,
  HistogramMetric,
  SummaryMetric,
} from "@selinarnd/nest-prom";
 
@Injectable()
export class MyService {
  constructor(
    @InjectCounterMetric('my_counter') private readonly counterMetric: CounterMetric,
    @InjectGaugeMetric('my_gauge') private readonly gaugeMetric: GaugeMetric,
    @InjectHistogramMetric('my_histogram') private readonly histogramMetric: HistogramMetric,
    @InjectSummaryMetric('my_summary') private readonly summaryMetric: SummaryMetric,
  ) {}
 
  doStuff() {
    this.counterMetric.inc();
  }
 
  resetCounter() {
    this.counterMetric.reset();
  }
}

Metric endpoint

At the moment, no way to configure the /metrics endpoint path.

PS: If you have a global prefix, the path will be {globalPrefix}/metrics.

API

PromModule.forRoot() options

  • withDefaultsMetrics: boolean (default true) enable defaultMetrics provided by prom-client
  • withDefaultController: boolean (default true) add internal controller to expose a /metrics endpoint
  • useHttpCounterMiddleware: boolean (default false) register http_requests_total counter

Auth/security

We do not provide any auth/security for the /metrics endpoints.

This is not the aim of this module, but depending of the auth strategy, you can apply a middleware on /metrics to secure it.

TODO

  • Update readme
    • Gauge
    • Histogram
    • Summary
  • Manage registries
  • Tests
  • Give possibility to custom metric endpoint
  • Adding example on how to secure /metrics endpoint
    • secret
    • jwt

Keywords

none

install

npm i @selinarnd/nest-prom

Downloadsweekly downloads

53

version

1.1.1

license

none

homepage

github.com

repository

Gitgithub

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