Probably this: https://news.ycombinator.com/item?id=31202038

I suggest you use https://hn.algolia.com/ to search for past stories or comments (make sure to use the correct combo selections, otherwise it won’t give you what you want!).

Not the person you're responding to, but if you're unaware/interested in relevant data this study [1] was just published 10 days ago and it's interesting. It compared the rates of myocarditis/pericarditis only within the 28 day period following vaccination to the rates experienced by unvaccinated individuals over a sample of 23 million Europeans.

Keep in mind the metric they use (IRR - incident rate ratio) is a ratio, not a percent. So an IRR of 15 means 1500% more events. Table 2 lays out everything quite nicely. To see it you need to click on figures/tables and scroll down a bit.

[1] - https://jamanetwork.com/journals/jamacardiology/fullarticle/...

I don't know if there is a discussion thread but an Israeli study was just published yesterday which found an association between COVID-19 vaccination and myocarditis in young men.

https://doi.org/10.1038/s41598-022-10928-z

(I am not taking a position on the findings of that study, just providing a link as a reference.)