I am always loathe to have Tesla touch the car at the risk they f#ck something up worse than it was. I've seen repairs spiral out of control with them where the fix was worse than the original issue.
On this one I'd bring it up to service since you plan to mount a roof rack. I'd actually urge you to get a tow hitch and carrier that would suit your purposes rather a roor rack. I'd even consider a hitch and small fold-up trailer before I'd go with a roof rack if I had a place for it. If not, then roof rack away after getting it fixed.
If Tesla says it is good, and they do nothing, and you then have an issue with the roof rack craking the roof, it is your baby. From what I've heard it is at least $1,500 to replace the roof. I avoid roof racks on glass roofs at all costs unless there is a factory roof rack option.