codin / prometheus_client_php
Requires
- php: >=5.6.3
- guzzlehttp/guzzle: ^6.2
Requires (Dev)
- phpunit/phpunit: 4.1.0
Suggests
- ext-apc: Required if using APCu.
- ext-redis: Required if using Redis.
This package is not auto-updated.
Last update: 2024-10-23 12:45:45 UTC
README
This project is no longer maintained here. Please go to https://github.com/endclothing/prometheus_client_php.
A prometheus client library written in PHP
This library uses Redis or APCu to do the client side aggregation. If using Redis, we recommend to run a local Redis instance next to your PHP workers.
How does it work?
Usually PHP worker processes don't share any state. You can pick from three adapters. Redis, APC or an in memory adapter. While the first needs a separate binary running, the second just needs the APC extension to be installed. If you don't need persistent metrics between requests (e.g. a long running cron job or script) the in memory adapter might be suitable to use.
Usage
A simple counter:
\Prometheus\CollectorRegistry::getDefault() ->getOrRegisterCounter('', 'some_quick_counter', 'just a quick measurement') ->inc();
Write some enhanced metrics:
$registry = \Prometheus\CollectorRegistry::getDefault(); $counter = $registry->getOrRegisterCounter('test', 'some_counter', 'it increases', ['type']); $counter->incBy(3, ['blue']); $gauge = $registry->getOrRegisterGauge('test', 'some_gauge', 'it sets', ['type']); $gauge->set(2.5, ['blue']); $histogram = $registry->getOrRegisterHistogram('test', 'some_histogram', 'it observes', ['type'], [0.1, 1, 2, 3.5, 4, 5, 6, 7, 8, 9]); $histogram->observe(3.5, ['blue']);
Manually register and retrieve metrics (these steps are combined in the getOrRegister...
methods):
$registry = \Prometheus\CollectorRegistry::getDefault(); $counterA = $registry->registerCounter('test', 'some_counter', 'it increases', ['type']); $counterA->incBy(3, ['blue']); // once a metric is registered, it can be retrieved using e.g. getCounter: $counterB = $registry->getCounter('test', 'some_counter') $counterB->incBy(2, ['red']);
Expose the metrics:
$registry = \Prometheus\CollectorRegistry::getDefault(); $renderer = new RenderTextFormat(); $result = $renderer->render($registry->getMetricFamilySamples()); header('Content-type: ' . RenderTextFormat::MIME_TYPE); echo $result;
Change the Redis options (the example shows the defaults):
\Prometheus\Storage\Redis::setDefaultOptions( [ 'host' => '127.0.0.1', 'port' => 6379, 'password' => null, 'timeout' => 0.1, // in seconds 'read_timeout' => 10, // in seconds 'persistent_connections' => false ] );
Using the InMemory storage:
$registry = new CollectorRegistry(new InMemory()); $counter = $registry->registerCounter('test', 'some_counter', 'it increases', ['type']); $counter->incBy(3, ['blue']); $renderer = new RenderTextFormat(); $result = $renderer->render($registry->getMetricFamilySamples());
Also look at the examples.
Development
Dependencies
- PHP 5.6
- PHP Redis extension
- PHP APCu extension
- Composer
- Redis
Start a Redis instance:
docker-compose up Redis
Run the tests:
composer install
# when Redis is not listening on localhost:
# export REDIS_HOST=192.168.59.100
./vendor/bin/phpunit
Black box testing
Just start the nginx, fpm & Redis setup with docker-compose:
docker-compose up
Pick the adapter you want to test.
docker-compose run phpunit env ADAPTER=apc vendor/bin/phpunit tests/Test/
docker-compose run phpunit env ADAPTER=redis vendor/bin/phpunit tests/Test/