statsd-php

A PHP client library for the statistics daemon (statsd) intended to send metrics from PHP applications.

Originally a fork of https://github.com/domnikl/statsd-php and original author Dominik Liebler. The Slickdeals team has taken over the project.

Installation

The best way to install statsd-php is to use Composer and add the following to your project's composer.json file:

{
    "require": {
        "slickdeals/statsd": "~3.0"
    }
}

Usage

<?php
$connection = new \Domnikl\Statsd\Connection\UdpSocket('localhost', 8125);
$statsd = new \Domnikl\Statsd\Client($connection, "test.namespace");

// the global namespace is prepended to every key (optional)
$statsd->setNamespace("test");

// simple counts
$statsd->increment("foo.bar");
$statsd->decrement("foo.bar");
$statsd->count("foo.bar", 1000);

When establishing the connection to statsd and sending metrics, errors will be suppressed to prevent your application from crashing.

If you run statsd in TCP mode, there is also a \Domnikl\Statsd\Connection\TcpSocket adapter that works like the UdpSocket except that it throws a \Domnikl\Statsd\Connection\TcpSocketException if no connection could be established. Please consider that unlike UDP, TCP is used for reliable networks and therefor exceptions (and errors) will not be suppressed in TCP mode.

Sampling Rate

You can set global sampling rate when constructing instance of Client. If a metric call passes lower sampling rate than the global one, it would be used instead. However if a metric call passes sampling rate higher than the global one, that would be ignored in favor of global sampling rate.

Timings

<?php
// timings
$statsd->timing("foo.bar", 320);
$statsd->time("foo.bar.bla", function() {
    // code to be measured goes here ...
});

// more complex timings can be handled with startTiming() and endTiming()
$statsd->startTiming("foo.bar");
// more complex code here ...
$statsd->endTiming("foo.bar");

Memory profiling

<?php
// memory profiling
$statsd->startMemoryProfile('memory.foo');
// some complex code goes here ...
$statsd->endMemoryProfile('memory.foo');

// report peak usage
$statsd->memory('foo.memory_peak_usage');

Gauges

statsd supports gauges, arbitrary values which can be recorded.

This method accepts both absolute (3) and delta (+11) values.

NOTE: Negative values are treated as delta values, not absolute.

<?php
// Absolute value
$statsd->gauge('foobar', 3);

// Pass delta values as a string.
// Accepts both positive (+11) and negative (-4) delta values.
$statsd->gauge('foobar', '+11');

Sets

statsd supports sets, so you can view the uniqueness of a given value.

<?php
$statsd->set('userId', 1234);

disabling sending of metrics

To disable sending any metrics to the statsd server, you can use the Domnikl\Statsd\Connection\Blackhole connection class instead of the default socket abstraction. This may be incredibly useful for feature flags. Another options is to use Domnikl\Statsd\Connection\InMemory connection class, that will collect your messages but won't actually send them.

StatsdAwareInterface

You can use the StatsdAwareInterface and StatsdAwareTrait in order to have dependency injection containers (such as Symfony's DI component) automatically detect the StatsdAwareInterface and inject the client into your service.

Symfony

# config/services.yaml
services:
  _instanceof:
    Domnikl\Statsd\StatsdAwareInterface:
      calls:
        - [setStatsdClient, ['@Domnikl\Statsd\Client']]

  Domnikl\Statsd\Client:
    arguments:
      $connection: '@app.statsd_connection'
      $namespace: '<namespace>'
      $sampleRateAllMetrics: '0.1' # set global sample rate of 10%

  app.statsd_connection:
    class: Domnikl\Statsd\Connection\UdpSocket
    arguments:
      $host: '%env(STATSD_HOST)%'
      $port: '%env(STATSD_PORT)%'

Authors

Original author: Dominik Liebler [email protected] Several other contributors - Thank you!