1866097 - Investigation: clients count with duplicated document ids

Status: NEW

(Data Platform and Tools :: Glean: SDK, task, P3)

Description

[Jan-Erik Rediger [:janerik]]

In my research on the glean event timestamps I noticed that for some client IDs we're getting multiple document IDs for a specific ping sequence number.

This is the usual client duplication:
The same client ID is used by different actual clients.

It can be identified by:

• Multiple distinct document IDs for the same (client id, seq) tuple
• Data in there differs

Query: https://sql.telemetry.mozilla.org/queries/96010/source?p_app=firefox_desktop&p_channel=nightly&p_days=30&p_ping=baseline#237352

The overall number of clients for which this happens is low for every app (like <1%).
Given the low number of clients this is not very concerning.
For now this bug acts merely as documentation for future-us.