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iterating on @maxine's location block to drop Gab user agents trying to fetch things from your nginx, I wrote a quick config snippet to dump all Gab user agents log lines to a file on their own (i.e. for automated iptables blocking, or some other clever solution.)

    log_format gab '$remote_addr - $remote_user [$time_local] '
                     '"$request" $status $body_bytes_sent '
                     '"$http_referer" "$http_user_agent"';
    map $http_user_agent $gabuser {
        ~*(gabsocial) 1;
        default 0;
    }
    access_log /var/log/nginx/gabusers.log gab if=$gabuser;