James Hetfield had a real life alcohol addiction and entered rehab for over a year.
There is a conversation about drinking Vodka in Russia.
There are scenes of beer drinking.
It's mentioned that a member enters rehab for alcoholism.
There's champagne drinking and toasting. A glass of champagne falls from a man's hand. A man says he's drunk.
There is a fair amount of drinking and drugs early in the career of Metallica. That is discussed in detail during the documentary - particularly in that it in part led to the dismissal of the original guitarist (Dave Mustaine) and was one of the reasons the bassist (Jason Newsted) left shortly before the filming began. So there is archival footage used that shows the band members drinking, acting intoxicated, and in at least one scene James is shown drinking beer and then pouring the remainder on the members of the crowd at a concert.
The members of Metallica are seen drinking and James Hetfield is sent off to rehab for drink related problems.
A few scenes contain smoking.