NodeExporterRelay/srv.conf

upstream pushgateway {
    server p_gw:9091;
}

server {
    listen 0.0.0.0:9091;
    server_name __;      
    location / {
        auth_basic "Pushgateway server authentication";
        auth_basic_user_file /etc/nginx/.htpasswd;
        proxy_pass http://pushgateway;
    } 
}