Before I ask my question, I must give a little bit of backstory.
We have an issue with one of applications licensed from a vendor that has not been resolved for at least 3 years. The application is used for deployment of software and administrators who use it often have little time to complete their work (due to agreements). My and my colleagues have raised multiple issues to the vendor, but so far we have been given no definitive answer (in all those years) as to what is causing this error.
In past week we have had a meeting with management team (heads of division) and after a meeting I asked one of them about automation issues giving previously mentioned problem as an example (I didn't get a chance to finish my question).
The person asked appareantly got interested with the issue and started to ask people under him why it hasn't been fixed in such a long time and it looks as the issue is now a hot topic. Next day I've been invited to a meeting where me and architect of my team got really into fight (he claimed he wasn't aware that the problem still exists... and I kinda responded to harshly asking if he didn't know about missing licenses too; I did escalate the issue to him and another person in a mail).
Now I am expected to prepare a raport on how big impact this problem is to our service. I am supposed to deliver the data in a week, but I don't actually know if this error happens often enough to be classified as this important (even though my coworkers agree that this is a big issue). (It will also be very difficult to gather statistics due to nature on how logs are stored.)
On one hand, I understand that I should not mention this issue to the top manager, but on the other hand - there is this wrong (IMO) approach to ignoring issues until they really become one.
What do I do to not make the situation worse while using this oportunity to resolve the error?