Background

During T353029: QA desktopwebuiactionstracking schema port to the new metrics platform, @jwang noted several discrepancies between the "old" instrument and the "new" instrument (the proposed migration of the old instruments to the Metrics Platform client libraries). Some of those discrepancies can be explained by the differences between the two versions of the old instrument themselves, i.e.:

In T353029#9649906, @phuedx wrote:

<snip />

1. DesktopWebUIActionsTracking ("Desktop") includes the bucketized viewport size but MobileWebUIActionsTracking ("Mobile") doesn't
2. Desktop uses [the onClickTrack() utility function] (source) but Mobile doesn't
3. Mobile tracks "mobile modes" (IIRC whether AMC is enabled) but Desktop doesn't
4. Mobile submits events like action=init,action_source="ns=0" (source) but Desktop submits events like action=init

AC

• A single schema is agreed on for both versions of the instrument
• The codebases for both versions of the instrument are merged
• The new instrument logs a single shape of data for all sites to one stream
• The old stream(s) are decommissioned
  • event.eventlogging_desktopwebuiactionstracking
  • event.eventlogging_mobilewebuiactionstracking