egg-prometheus's Introduction

egg-prometheus

Prometheus plugin for egg framework

Install

$ npm i egg-prometheus --save

Usage

Enable the plugin

Change ${app_root}/config/plugin.js to enable Prometheus plugin:

exports.prometheus = {
  enable: true,
  package: "egg-prometheus",
};

Configuration

exports.prometheus = {
  timeout: 3000
  scrapePort: 3000,
  scrapePath: '/metrics',
  defaultHttpMetricsFilter: ({ method, status, routerName, path }) => true,
  defaultLabels: { ... },
};

timeout: metrics pull timeout
scrapePort: the port to scrape metrics from
scrapePath: the path to scrape metrics from
defaultLabels: static labels may be applied to every metric emitted by a registry
defaultHttpMetricsFilter: can custom filter default http metrics, return false can prevent metrics

Default Metrics

http_response_time_ms summary: ms to handle a request
http_request_rate counter: number of requests to a route

while egg-rpc-base is enabled

rpc_consumer_response_time_ms summary: ms of rpc time consuming
rpc_consumer_request_rate counter: number of rpc calls
rpc_consumer_fail_response_time_ms summary: ms of fail rpc time consuming
rpc_consumer_request_fail_rate counter: number of fail rpc calls
rpc_consumer_request_size_bytes summary: rpc request size in bytes
rpc_consumer_response_size_bytes summary: rpc response size in bytes
rpc_provider_response_time_ms summary: ms of request processed time
rpc_provider_request_rate counter: number of rpc calls
rpc_provider_fail_response_time_ms summary: ms of fail request processed time
rpc_provider_request_fail_rate counter: number of fail rpc calls

Custom Metrics

const counter = new app.prometheus.Counter({
  name: "xxx_total",
  help: "custom counter",
  labelNames: ["xxx"],
});

const gauge = new app.prometheus.Gauge({
  name: "xxx_gauge",
  help: "custom gauge",
  labelNames: ["xxx"],
});

const histogram = new app.prometheus.Histogram({
  name: "xxx_histogram",
  help: "custom histogram",
  labelNames: ["xxx"],
});

const summary = new app.prometheus.Summary({
  name: "xxx_summary",
  help: "custom summary",
  labelNames: ["xxx"],
});