I'm sure you could write a DB query to accomplish this, but the fastest way I can think of would be to, on the issue itself, click on the Activity tab. That will show you the date/time of when a particular label was attached to an issue, (among other things).
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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