Notification of a tracker tracking me

That's not a tracker notification.

It’s some advertising.

Specifically, some advertising crafted using words intended to cause a fear reaction. HACKER! VIRUS! INFECTED!! and so on.

These ads are usually offering an unnecessary and problematic app completely unrelated to what the advertisement claims was detected, too.

Clear the ad, and enjoy the rest of your day.

Clues that this stuff is lying, and not from Apple: use of trigger words including “hacker” and “virus”. The use of a countdown, with a threat. Bad grammar and punctuation, too. Oh, and tracking devices don’t grant access to your gear, and don’t directly provide your identity.

And for completeness , here is what an actual tracking notification looks like, and how it works:

Detect unwanted trackers - Apple Support

Apple will never send a message like this.

You are looking at a scam here that is trying to trick you into revealing your personal information.

Close and ignore this message.

See also:

Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support