Laravel Loki

Zero-config Grafana Loki log driver for Laravel. Sends logs in real time to Loki via HTTP, with basic auth and built-in fault tolerance.

Features

• Zero-config — just set .env, done
• Real-time — no cron job or scheduled command needed
• Fault-tolerant — if Loki is down, your app keeps running
• Basic Auth — supports authentication via reverse proxy
• Batching — buffers logs and sends them efficiently in batches
• Auto-labels — app, environment, server, level, channel are added automatically
• No dependencies — uses PHP's built-in cURL, no Guzzle required

Requirements

• PHP 8.2+
• Laravel 10, 11, or 12
• PHP ext-curl
• A Grafana Loki server

Installation

composer require bureaupartners/laravel-loki-logging

The service provider is loaded automatically (Laravel auto-discovery).

Configuration

1. Add the Loki channel to config/logging.php

'channels' => [

    'stack' => [
        'driver' => 'stack',
        'channels' => explode(',', env('LOG_STACK', 'daily,loki')),
        'ignore_exceptions' => false,
    ],

    'loki' => [
        'driver' => 'loki',
        'level' => env('LOG_LEVEL', 'debug'),
    ],

    // ... your other channels
],

2. Configure your .env

LOG_CHANNEL=stack
LOG_STACK=daily,loki
LOG_LEVEL=debug

# Loki server URL
LOKI_URL=http://10.0.0.50:3100

# Unique name for this server
LOKI_SERVER=web-01

# Optional: basic auth (if you have a proxy with auth)
LOKI_AUTH_USER=
LOKI_AUTH_PASSWORD=

Done! All Log:: calls now go to Loki and to your daily log file.

3. Optional: publish the config

php artisan vendor:publish --tag=loki-config

This creates config/loki.php where you can set extra labels, batch size, and timeouts.

Usage

Just use Laravel's standard logging:

use Illuminate\Support\Facades\Log;

Log::info('User logged in', ['user_id' => 123]);
Log::warning('Low stock', ['product' => 'SKU-456', 'stock' => 3]);
Log::error('Payment failed', ['order_id' => 789, 'gateway' => 'mollie']);
Log::debug('SQL query', ['query' => $sql, 'time_ms' => 45]);

Context is sent automatically as key=value pairs, so you can filter on it in Grafana.

Querying in Grafana

Open Grafana → Explore → select Loki as the datasource.

# All logs from a server
{server="web-01"}

# Only errors from your app
{app="my-app", level="error"}

# Search by text
{app="my-app"} |= "Payment failed"

# Errors from a specific server
{server="web-01", level="error"}

# Filter by multiple levels
{app="my-app", level=~"error|warning"}

# Search by context values
{app="my-app"} |= "order_id=789"

# Count errors per 5 minutes (for dashboards/alerts)
count_over_time({app="my-app", level="error"}[5m])

Advanced configuration

Extra labels

In config/loki.php:

'labels' => [
    'team' => 'backend',
    'version' => '2.1.0',
],

Or per channel in config/logging.php:

'loki' => [
    'driver' => 'loki',
    'level' => 'debug',
    'labels' => [
        'service' => 'api',
    ],
],

Multiple Loki channels

'loki-errors' => [
    'driver' => 'loki',
    'level' => 'error',
    'url' => 'http://loki-production:3100',
],

'loki-debug' => [
    'driver' => 'loki',
    'level' => 'debug',
    'url' => 'http://loki-staging:3100',
],

Channel config options

How it works

1. Log::info() calls the Loki handler
2. The handler buffers the log line (until batch_size is reached)
3. When the batch is full OR at the end of the PHP request → it sends everything to Loki via cURL
4. WhatFailureGroupHandler catches all errors — your app always keeps running
5. Labels (app, server, level, etc.) are added automatically

License

MIT