From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: [nftables v0.9.2 | kernel 4.19.93] logging protocols in inet
 family table require explicit protocol statement?
Date: Wed, 5 Feb 2020 17:21:04 +0100
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To: =?utf-8?B?0b3SieG2rOG4s+KEoA==?= <vtol@gmx.net>
Cc: Florian Westphal <fw@strlen.de>, "netfilter@vger.kernel.org" <netfilter@vger.kernel.org>

ѽ҉ᶬḳ℠ <vtol@gmx.net> wrote:
> Not directly related to the subject but curious about concentrating log
> flags, level and prefix, is this valid syntax (within context of course):
> 
> log flags all level debug prefix
> 
> or does it require
> 
> log flags all log level debug log prefix

The last form specifies multiple log statements,
which is probably not what you want:

log flags all
log level debug
log prefix

Which would log 3 times.
So, first version is what you want/need.