prismamedia / metrics
Prometheus metrics exporter
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Type:symfony-bundle
Requires
- php: >=7.4
- symfony/dependency-injection: ^4.4|^5.0|^6.0|^7.0
Requires (Dev)
- symfony/browser-kit: ^4.4|^5.0|^6.0|^7.0
- symfony/framework-bundle: ^4.4|^5.0|^6.0|^7.0
- symfony/phpunit-bridge: ^4.4|^5.0|^6.0|^7.0
- symfony/yaml: ^4.4|^5.0|^6.0|^7.0
README
This package is a Symfony bundle for exporting metrics to Prometheus.
Create your own MetricGenerator
services to generate values on-demand, the bundle will expose them under the /metrics
endpoint.
It does not provide any metric by default, you have to code your own.
Usage
Require the package
composer require prismamedia/metrics
Register the bundle
# config/bundles.php return [ // ... PrismaMedia\Metrics\Bundle\PrismaMediaMetricsBundle::class => ['all' => true], // ... ];
Import routing file
# config/routes.yaml metrics: resource: '@PrismaMediaMetricsBundle/Resources/config/routes.xml'
Implement your own metric generator
Your metrics are generated on demand by a class implementing PrismaMedia\Metrics\MetricGenerator
interface.
The best practice is to create a distinct classes for distinct metric names. Each class can return several values with distinct labels.
In the following example, we expose a metric named app_article_total
labelled with each status
. In Prometheus (& Grafana), the values can be added
in order to get the overall total.
<?php # src/Metrics/ArticleCountMetric.php namespace App\Metrics; use Doctrine\DBAL\Connection; use PrismaMedia\Metrics\Metric; use PrismaMedia\Metrics\MetricGenerator; class ArticleCountMetric implements MetricGenerator { private $connection; public function __construct(Connection $connection) { $this->connection = $connection; } /** * @return Metric[] */ public function getMetrics(): \Traversable { // SELECT a.status, COUNT(*) as total FROM article GROUP BY a.status $qbd = $this->connection->createQueryBuilder(); $qbd->select('a.status, COUNT(*) as total') ->from('article', 'a') ->groupBy('a.status'); foreach ($qbd->execute()->fetchAll() as $row) { // app_article_total{status=<status>} <total> yield new Metric('app_article_total', (int) $row['total'], [ 'status' => $row['status'], ]); } } }
Declare the class as a service in you config/services.yaml
or config/services.php
.
It will be automatically tagged prisma_media.metric
and added to the aggregator.
The /metrics
endpoint will return something like this:
# curl https://localhost:8080/metrics app_article_total{status=published} 230 app_article_total{status=review} 2 app_article_total{status=draft} 5
Contributing
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.