It's no secret that Metallica was influenced by Motorhead and the Ramones, so I'm not surprised. I was never a metal fan, but that band is more than metal, their influences and roots are far beyond pure metal.
Incidentally, I saw the Ramones live at the Ritz in NYC sometime around 1989. They had a giant video screen playing videos before the show started. The last two songs played before they took the stage? One by Metallica and Killed By Death by Motorhead.
No one asked but never a metal fan.
Many antecedents and many claims to as to who "really" gave us the genre.
You can make a case (yawn) for Sabbath, Zep and Deep Purple. I don't know enough about who came before, or concurrently, to assign bragging rights.
To me, metal is basically souped-up blues, elemental, loud, adolescent, kind of dumb.
There's a track called "Black Metal." I am not thinking about the band Venom (sic). It came out, I think, in the oughts.
I don't believe it was recorded by a metal band. I liked the chorus.