Integrated telemetry

[6aKa]

Count and store metrics for http/ws/pg/minion, like a total requests/request per sec/duration/query length.

[kraih]

That already exists for the Perl version as a plugin. https://github.com/mojolicious/mojo-status

[6aKa]

Perl plugin collect metrics only for server. I talk about global storage and pluggable system for collectors. With default (configurable)/metrics endpoint, which return data in prometheus format.
Like this

import mojo, {serverMetricsCollector, wsMetricsCollector} from '@mojojs/core';
import {pgMetricsCollector} from '@mojojs/pg';

const app = mojo();
app.telemetry(serverMetricsCollector); -> collect http_requests_total, http_requests_duration
app.telemetry(wsMetricsCollector); -> collect wss_requests_total, wss_requests_duration
app.telemetry(pgMetricsCollector);

And with lowlevel functions to work with values, ex

app.get('/', async ctx => {
  await ctx.requestCount.inc('http_requests_total', {prefix: 'root'}); -> manually inc root_http_requests_total metric
  await ctx.render({json: {name: ctx.config.name}});
});

[kraih]

Sure, makes for a good plugin. All necessary hooks for metrics collection should exist already.