I've completed a first pass of this analysis. As the task description mentions, the approach here was to gather data from Arabic, Bengali, and Czech Wikipedia prior to the bug going into effect, and compare that with a similar dataset right after deployment. In this case, I chose to use two weeks of data post-deployment, as that's roughly the amount of data we have for the prior period.

I chose to focus on the workflow from On Task to Task Completion, split by whether the user skipped or completed onboarding. The findings are as follows:

• Users who skipped onboarding: we cannot conclude anything about the impact of this bug because no user completed the task on their first interaction with the feature during the pre-bug period.
• Users who completed onboarding: it appears that this bug reduced the proportion of users reaching the Edit Summary by 20–25%. Prior to the bug going into effect, 100% of users who focused on the caption entry box also reached the Edit Summary. After the bug went into effect, this is reduced to 75% of users. I'm hesitant to say that every user would have reached the Edit Summary because the numbers are fairly small in this short dataset, hence the 20–25% estimate.

In the Desktop Funnel analysis, we used a dataset from all seven wikis that currently have Add an Image and found that 75.9% of users who focused on the caption entry box also reached the Edit Summary. It seems this number could've been around 95% or possibly higher if the bug was not present. We can always wait a bit and do this analysis again but using data from after the bug was fixed.

Moving this to "Needs Sign-off" for @KStoller-WMF and @MMiller_WMF to review.