Readers/Web/Metrics Platform Adoption/Sampling Rates

Metrics Platform Transition

Overview

This document outlines the transition from the Event Platform to the Metrics Platform, including changes in sampling rates, event tracking, and schema structure.

Key Changes in Sampling Rates

Standardization of Default Sampling Rates

The default analytics sampling rate for both desktop and mobile is now 0.2 in the Metrics Platform.

Previously, mobile tracking was sampled at 0.1 → increased to align with desktop tracking.

Explicit Sampling Rate for OfficeWiki

In the Metrics Platform, OfficeWiki's mobile sampling rate is explicitly set to 0, ensuring no mobile data is collected.

Configuration Files

Event Platform (Legacy)

• InitialiseSettings.php

Metrics Platform (Current)

• ext-EventLogging.php

Before and After Comparison

Event Platform (Legacy) Desktop Tracking

'wgWMEDesktopWebUIActionsTracking' => [
    'default' => 0.2,
    'legacy-vector' => 0,
    'officewiki' => 0,
    'testwiki' => 1,   // 100% of events logged
    'enwiki' => 0.01,  // 1% of events logged
];

Metrics Platform (Current) Unified Sampling Rate

'mediawiki.web_ui_actions' => [
    'schema_title' => 'analytics/mediawiki/product_metrics/web_ui_actions',
    'destination_event_service' => 'eventgate-analytics-external',
    'producers' => [
        'metrics_platform_client' => [...],
        'sample' => [
            'unit' => 'session',
            'rate' => 0.2,
        ],
    ],
];

Why Were These Changes Made?

• Combining desktop and mobile tracking → reduces redundancy and simplifies data analysis.
• Increasing mobile sampling rate from 0.1 to 0.2 → ensures consistency with desktop tracking.
• Explicitly setting OfficeWiki sampling to 0 → prevents accidental data collection.

Final Thoughts

• The transition to the Metrics Platform standardizes tracking and makes sampling rates more predictable.
• Analysts should be aware of the changes when comparing past Event Platform data with new Metrics Platform data.