For measurement with "add an image", we are going to cleave closely to the same research questions, measurements, experiment plan, and leading indicators as for "add a link" in the "[[ https://docs.google.com/document/d/1gp7KpgZdulA-fdHDsZrBkMrkys4IgzD1-WEhj29bQjc/edit?ts=601b1cbd# | Add a Link - Measurement Specification ]]" document. This task and its subtasks contain the full set of instrumentation needs, which are also copied into "instrumentation" sections on the relevant frontend tasks.
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For users who have the Homepage enabled, we want to capture their user ID along with the information below whenever they interact with an "add an image" task.
* Distinguish by wiki.
* Analyze how much time elapses between each action.
* Know whether each action was taken from desktop or mobile.
* Know which article the user is on (through page title and page id).
* Include timestamps with millisecond precision.