@lokalise/fastify-extras/dist/plugins/metricsPlugin.js

Opinionated set of fastify plugins, commonly used in Lokalise

import fastify from 'fastify';
import fastifyMetrics from 'fastify-metrics';
import fp from 'fastify-plugin';
const METRICS_PORT = 9080;
function plugin(app, opts, done) {
    // @ts-expect-error fixme
    void app.register(fastifyMetrics, {
        defaultMetrics: { enabled: true },
        endpoint: null,
        clearRegisterOnInit: true,
        name: 'metrics',
        routeMetrics: { enabled: true },
    });
    try {
        const promServer = fastify({
            loggerInstance: opts.logger ? opts.logger : undefined,
            logger: opts.logger === false ? false : undefined,
            disableRequestLogging: opts.disablePrometheusRequestLogging ?? true,
        });
        promServer.route({
            url: '/metrics',
            method: 'GET',
            logLevel: 'info',
            schema: {
                // hide route from swagger plugins
                hide: true,
            },
            handler: async (_, reply) => {
                const metrics = await app.metrics.client.register.metrics();
                return reply.type('text/plain').send(metrics);
            },
        });
        app.addHook('onClose', async () => {
            await promServer.close();
        });
        promServer
            .listen({
            port: METRICS_PORT,
            host: opts.bindAddress,
            listenTextResolver: (address) => {
                return `Prometheus metrics server listening at ${address}`;
            },
        })
            .then(() => {
            done();
        })
            .catch((err) => {
            const logObject = opts.errorObjectResolver(err);
            promServer.log.error(logObject);
            done(new Error('Critical error when trying to launch metrics server'));
        });
    }
    catch (err) {
        done(err);
    }
}
export const metricsPlugin = fp(plugin, {
    fastify: '5.x',
    name: 'metrics-plugin',
});
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