Everything always ends up on a confluence dumping ground, and I have trouble finding pages I wrote after any sort of significant period of time, much less finding things other people wrote.
The issue was fairly unique and actually tested for and the list of implemented defect fixes in testing env. was listed on our end ( and maybe for once the fact we don't use confluence helped ), which helped to narrow it down on the vendor's side ( I am not sure what they use internally ) and it certainly helped that there were only two related projects for that specific move for the date the issue occurred.
FWIW, it is possible that I am just still relatively new to this ( 3 years for the testing part ) so all the issues we experience don't all blend together yet.
But I can't imagine that's the kind of tracking greatpostman had in mind, and it's definitely not the kind of tracking that most managers I've worked with try to produce.
But it goes back.. how do you know something will be important?