==== Goal
This task is about instrumenting Special:CheckUser so we can keep an eye on adoption as we roll it out across our projects.
==== Metrics
* Q: How often is the tool used?
** !!How many times is //Special:Investigate// accessed?!!
* Q: How many users does the investigation start with?
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* Q: How many users are under investigation by the time the investigation ends?
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* Q: How much time does a user spend on Preliminary check versus Compare versus Timeline? OR how often did they access the individual tabs over the course of the investigation?
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* Q: How many times were the tools under the IP address clicked?
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* Q: How many times did a user use sticky highlights?
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* Q: How many times did a user use the filters?
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* Q: How many times did a user get incomplete results?
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* Q: How long did a user spend waiting for the results? And how often did they quit the investigation (page close or back button) while the results were being generated?
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