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MediaWiki extensions manual
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Release status: beta
Implementation Ajax, Database
Description Logs image-related metrics from client-side
Author(s) Gergő Tisza (Tgrtalk)
Latest version 0.0.1 (2014-08-20)
MediaWiki 1.24+
PHP 5.3+
Database changes No
License GNU General Public License 2.0 or later
  • $wgImageMetricsSamplingFactor
Translate the ImageMetrics extension if it is available at translatewiki.net
Check usage and version matrix.
Issues Open tasks · Report a bug

The goal of the ImageMetrics extension is to log image-related client-side metrics. Currently, the only metric being tracked is the loading time of file page images.

What data is logged?[edit]

See the ImageMetricsLoadingTime schema.


The EventLogging extension is required for this extension to work.


The extension can be retrieved directly from Git [?]:

  • Browse code
  • Some extensions have tags for stable releases.
  • Each branch is associated with a past MediaWiki release. There is also a "master" branch containing the latest alpha version (might require an alpha version of MediaWiki).

Extract the snapshot and place it in the extensions/ImageMetrics/ directory of your MediaWiki installation.

If you are familiar with git and have shell access to your server, you can also obtain the extension as follows:

cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/ImageMetrics.git

Installing / Configuration[edit]

To enable, add this to your LocalSettings.php:

require_once "$IP/extensions/EventLogging/EventLogging.php";  // required dependency
require_once "$IP/extensions/ImageMetrics/ImageMetrics.php";
$wgImageMetricsSamplingFactor = 10000;  // log 1:10,000 requests.

To install in a MediaWiki-Vagrant development environment, use the imagemetrics role.