Magento 2 Prometheus Exporter

A comprehensive Magento 2 module that exposes essential Magento metrics in Prometheus format, enabling powerful monitoring and observability for your e-commerce platform.

🚀 Features

• 📊 Rich Metrics Collection: Monitors orders, products, customers, CMS content, cron jobs, indexers, and more
• 🔧 Configurable Metrics: Enable/disable specific metrics through Magento admin interface
• 🔐 Secure Access: Bearer token authentication support to protect your metrics endpoint
• ⚡ Performance Optimized: Efficient cron-based data aggregation to minimize performance impact
• 🎯 Prometheus Ready: Native Prometheus format output for seamless integration
• 🔌 Extensible Architecture: Easy to add custom metrics with clean interfaces

📋 Table of Contents

• Installation
• Configuration
• Prometheus Setup
• Available Metrics
• Security
• Custom Metrics
• CLI Commands
• Architecture
• Troubleshooting
• Contributing
• License

📦 Installation

Requirements

• Magento 2.3.x or higher
• PHP 7.4 or higher
• Composer

Install via Composer

composer require run_as_root/magento2-prometheus-exporter
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento cache:flush

Verify Installation

After installation, your metrics endpoint will be available at:

https://your-magento-store.com/metrics

⚙️ Configuration

Admin Configuration

Navigate to Stores → Configuration → Prometheus → Metric Configuration to:

• Enable/disable specific metric collectors
• Configure authentication settings
• Set collection intervals
• Manage metric labels and groupings

Cron Configuration

The module automatically registers a cron job that runs every minute to aggregate metrics. The job uses a dedicated cron group: run_as_root_prometheus_metrics_aggregator.

🎯 Prometheus Setup

Basic Configuration

Add the following scrape configuration to your prometheus.yml:

scrape_configs:
  - job_name: 'magento-2'
    scrape_interval: 5m
    scrape_timeout: 60s
    metrics_path: /metrics
    static_configs:
      - targets: 
          - 'your-magento-store.com'

With Authentication

For production environments, secure your metrics endpoint:

scrape_configs:
  - job_name: 'magento-2'
    scrape_interval: 5m
    scrape_timeout: 60s
    metrics_path: /metrics
    authorization:
      type: 'Bearer'
      credentials: 'your-bearer-token-here'
    static_configs:
      - targets: 
          - 'your-magento-store.com'

Advanced Configuration with Labels

scrape_configs:
  - job_name: 'magento-2'
    scrape_interval: 5m
    scrape_timeout: 60s
    metrics_path: /metrics
    authorization:
      type: 'Bearer'
      credentials: 'your-bearer-token-here'
    static_configs:
      - targets: 
          - 'your-magento-store.com'
    relabel_configs:
      - source_labels: [__address__]
        target_label: instance
        replacement: 'magento-production'

📊 Available Metrics

Order Metrics

Metric	Type	Labels	Description
magento_orders_count_total	gauge	status, store_code	Total count of orders by status and store
magento_orders_amount_total	gauge	status, store_code	Total revenue by order status and store
magento_order_items_count_total	gauge	status, store_code	Total count of order items

Product & Catalog Metrics

Metric	Type	Labels	Description
magento_products_by_type_count_total	gauge	product_type	Count of products by type (simple, configurable, etc.)
magento_catalog_category_count_total	gauge	status, menu_status, store_code	Count of categories by status

EAV & Attribute Metrics

Metric	Type	Labels	Description
magento_eav_attribute_count_total	gauge	-	Total count of EAV attributes
magento_eav_attribute_options_above_recommended_level_total	gauge	-	Count of attributes with more than 100 options (performance risk)

Customer Metrics

Metric	Type	Labels	Description
magento_customer_count_total	gauge	store_code	Total count of registered customers

Content Metrics

Metric	Type	Labels	Description
magento_cms_block_count_total	gauge	store_code	Count of CMS blocks
magento_cms_page_count_total	gauge	store_code	Count of CMS pages

System Health Metrics

Metric	Type	Labels	Description
magento_cronjob_count_total	gauge	status, job_code	Count of cron jobs by status
magento_cronjob_broken_count_total	gauge	-	Count of broken cron jobs
magento_indexer_backlog_count_total	gauge	title	Count of items in indexer backlog

Infrastructure Metrics

Metric	Type	Labels	Description
magento_store_count_total	gauge	status	Count of stores by status
magento_website_count_total	gauge	-	Total count of websites
magento_shipments_count_total	counter	source, store_code	Count of shipments created

🔐 Security

Authentication Setup

1. Generate Bearer Token: Navigate to Magento Admin → System → Integrations
2. Create New Integration: Set up API access with appropriate permissions
3. Configure Token: Use the generated access token in your Prometheus configuration

Best Practices

• Always use HTTPS for metrics endpoints in production
• Regularly rotate authentication tokens
• Restrict access to metrics endpoint via firewall rules
• Monitor access logs for unusual activity

IP Whitelisting

Consider restricting access to your Prometheus server IPs:

location /metrics {
    allow 10.0.0.0/8;     # Your Prometheus server
    allow 172.16.0.0/12;  # Internal network
    deny all;
    try_files $uri $uri/ /index.php?$args;
}

🔧 Custom Metrics

Creating a Custom Metric Aggregator

1. Implement the Interface:

<?php
namespace YourNamespace\YourModule\Aggregator;

use RunAsRoot\PrometheusExporter\Api\MetricAggregatorInterface;
use RunAsRoot\PrometheusExporter\Service\UpdateMetricService;

class CustomMetricAggregator implements MetricAggregatorInterface
{
    private UpdateMetricService $updateMetricService;

    public function __construct(UpdateMetricService $updateMetricService)
    {
        $this->updateMetricService = $updateMetricService;
    }

    public function aggregate(): void
    {
        // Your metric collection logic here
        $value = $this->calculateCustomMetric();
        
        $this->updateMetricService->update(
            'your_custom_metric_total',
            (string) $value,
            'gauge',
            'Description of your custom metric',
            ['label1' => 'value1', 'label2' => 'value2']
        );
    }

    private function calculateCustomMetric(): int
    {
        // Implement your metric calculation
        return 42;
    }
}

2. Register in DI Configuration (etc/di.xml):

<type name="RunAsRoot\PrometheusExporter\Metric\MetricAggregatorPool">
    <arguments>
        <argument name="items" xsi:type="array">
            <item name="YourCustomAggregator" xsi:type="object">YourNamespace\YourModule\Aggregator\CustomMetricAggregator</item>
        </argument>
    </arguments>
</type>

Example: Product Rating Aggregator

<?php
namespace YourNamespace\YourModule\Aggregator;

use Magento\Review\Model\ResourceModel\Review\CollectionFactory;
use RunAsRoot\PrometheusExporter\Api\MetricAggregatorInterface;
use RunAsRoot\PrometheusExporter\Service\UpdateMetricService;

class ProductRatingAggregator implements MetricAggregatorInterface
{
    private CollectionFactory $reviewCollectionFactory;
    private UpdateMetricService $updateMetricService;

    public function __construct(
        CollectionFactory $reviewCollectionFactory,
        UpdateMetricService $updateMetricService
    ) {
        $this->reviewCollectionFactory = $reviewCollectionFactory;
        $this->updateMetricService = $updateMetricService;
    }

    public function aggregate(): void
    {
        $collection = $this->reviewCollectionFactory->create()
            ->addStatusFilter(\Magento\Review\Model\Review::STATUS_APPROVED);

        $averageRating = $collection->getConnection()
            ->fetchOne('SELECT AVG(rating_value) FROM rating_option_vote');

        $this->updateMetricService->update(
            'magento_product_average_rating',
            (string) round($averageRating, 2),
            'gauge',
            'Average product rating across all approved reviews'
        );
    }
}

💻 CLI Commands

Collect Metrics Manually

php bin/magento run_as_root:metrics:collect

View Current Metrics

php bin/magento run_as_root:metrics:show

Clear Metrics Data

php bin/magento run_as_root:metrics:clear

🏗️ Architecture

Data Flow

1. Cron Execution: Every minute, the run_as_root_prometheus_metrics_aggregator cron group executes
2. Metric Aggregation: Each enabled aggregator collects and processes data
3. Data Storage: Aggregated metrics are stored in run_as_root_prometheus_metrics table
4. Endpoint Response: /metrics controller serves data in Prometheus format

Key Components

• MetricAggregatorInterface: Contract for all metric collectors
• MetricAggregatorPool: Registry of all available aggregators
• UpdateMetricService: Service for storing metric data
• PrometheusController: HTTP endpoint for serving metrics

Database Schema

The module creates a dedicated table run_as_root_prometheus_metrics with the following structure:

• metric_id: Primary key
• metric_code: Unique metric identifier
• metric_value: Numeric value
• metric_type: Type (gauge, counter, histogram)
• metric_help: Description text
• metric_labels: JSON-encoded labels
• updated_at: Last update timestamp

🔍 Troubleshooting

Common Issues

Metrics Not Updating

# Check cron status
php bin/magento cron:status

# Run metrics collection manually
php bin/magento run_as_root:metrics:collect

# Check system logs
tail -f var/log/system.log | grep prometheus

Permission Denied on /metrics

• Verify web server has read access to Magento files
• Check Magento file permissions: find . -type f -exec chmod 644 {} \;
• Ensure proper ownership: chown -R www-data:www-data .

High Memory Usage

• Reduce collection frequency in cron configuration
• Disable unused metric aggregators in admin configuration
• Consider implementing metric data retention policies

Debug Mode

Enable debug logging by adding to app/etc/env.php:

'system' => [
    'default' => [
        'prometheus_exporter' => [
            'debug' => '1'
        ]
    ]
]

Performance Monitoring

Monitor the impact of metric collection:

# Check metric collection execution time
grep "prometheus.*aggregator" var/log/system.log

# Monitor database table size
SELECT COUNT(*) as total_metrics, 
       MAX(updated_at) as last_update 
FROM run_as_root_prometheus_metrics;

🤝 Contributing

We welcome contributions! Here's how you can help:

Development Setup

1. Fork the repository
2. Clone your fork: git clone https://gitlab.com/your-username/magento2-prometheus-exporter.git
3. Install dependencies: composer install
4. Create a feature branch: git checkout -b feature/your-feature-name

Code Standards

• Follow Magento 2 coding standards
• Write unit tests for new features
• Update documentation for new metrics or features
• Use meaningful commit messages

Pull Request Process

1. Ensure all tests pass: vendor/bin/phpunit
2. Update the CHANGELOG.md
3. Submit a pull request with a clear description
4. Respond to code review feedback

Reporting Issues

Please include:

• Magento version
• PHP version
• Module version
• Detailed error messages
• Steps to reproduce

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• run_as_root GmbH - Original development and maintenance
• Prometheus Community - For the excellent monitoring toolkit
• Magento Community - For feedback and contributions

📞 Support

• Email: info@run-as-root.sh
• GitLab Issues: Report a bug
• Documentation: Wiki

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