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Incidents/20150529-Tagging

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Summary

Changes deployed on an emergency basis Friday, 2015-05-22, caused some tagging data to no longer be captured, causing an unrecoverable loss of data. This was feared to invalidate the Visual Editor A/B Pilot test in progress; however, that test used a different mechanism to gather data and was not affected.

Relevant: bug T100248, bug T100439

Timeline

This is a step by step outline of what happened to cause the incident and how it was remedied. Please ensure to remove private information.

Conclusions

What weakness did we learn about and how can we address them?

Actionables

Explicit next steps to prevent this from happening again as much as possible, with Phabricator tasks linked for every step.