HAProxy flapping status after disable

Issue

• After sending a disable command to the HAProxy backend, the backend service seems to flap back and forth from UP to MAINT.
• Data continues to flow to the backend even after it has been disabled.
• The following can be observed:

[root@haproxy ~]# echo "disable server mybackend/web-1" | socat stdio unix-connect:/var/lib/haproxy/stats

[root@haproxy ~]# echo "show stat" | socat stdio unix-connect:/var/lib/haproxy/stats | grep web- |  cut -d ',' -f 1,2,18
mybackend,web-1,UP
mybackend,web-2,UP
[root@haproxy ~]# echo "show stat" | socat stdio unix-connect:/var/lib/haproxy/stats | grep web- |  cut -d ',' -f 1,2,18
mybackend,web-1,UP
mybackend,web-2,UP
[root@haproxy ~]# echo "show stat" | socat stdio unix-connect:/var/lib/haproxy/stats | grep web- |  cut -d ',' -f 1,2,18
mybackend,web-1,MAINT
mybackend,web-2,UP
[root@haproxy ~]# echo "show stat" | socat stdio unix-connect:/var/lib/haproxy/stats | grep web- |  cut -d ',' -f 1,2,18
mybackend,web-1,UP
mybackend,web-2,UP