dolphin/grafana-loki-metrics/index.php

<?php
/**
 *  dolphin. Collection of useful PHP skeletons.
 *  Copyright (C) 2024 Johannes 'Banana' Keßler
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the COMMON DEVELOPMENT AND DISTRIBUTION LICENSE
 *
 * You should have received a copy of the
 * COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
 * along with this program.  If not, see http://www.sun.com/cddl/cddl.html
 */

/**
 * This is an exmaple to show how to send custom logs/metrics
 * to loki and use them in grafana
 */

# basic loki endpoint information
const LOKI_HOST = "localhost";
const LOKI_PORT = 3100;
const LOKI_PUSH_API = "/loki/api/v1/push";
# loki does not have protection
# https://grafana.com/docs/loki/latest/operations/authentication/
# this example does use basic auth
# if you do not use it, comment both constants
const LOKI_USER = "name";
const LOKI_USER_PW = "pass";

# Loki
require_once 'loki.php';

# see https://grafana.com/docs/loki/latest/reference/loki-http-api/#ingest-logs for
# data structure
$Loki = new Loki(LOKI_HOST, LOKI_PORT, array("streamlabel1" => "value1", "streamlabel2" => "value2"));

$Loki->log("log line text", array("structuredData" => "value"));
$Loki->log("log line text", array("structuredData" => "value2"));

# send the data to loki at the end to avoid and multiple calls and breaking
# the process of the script.
$Loki->send();