This variable was used by the wrapper which was removed in
a6cfa9098e5a. The correct way to do seamless reload is now to enable
"expose-fd listeners" on the stat socket.
After=network.target
[Service]
-# You can point the environment variable HAPROXY_STATS_SOCKET to a stats
-# socket if you want seamless reloads.
Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid"
ExecStartPre=@SBINDIR@/haproxy -f $CONFIG -c -q
ExecStart=@SBINDIR@/haproxy -Ws -f $CONFIG -p $PIDFILE