failover issue between datacenters with GSLB

here is an example 

#!/bin/bash
POOL="Your_Pool_name"
THRESHOLD=2

UP_COUNT=$(tmsh show ltm pool $POOL members | grep "Available Members" | awk '{print $4}')

echo "[$(date)] Pool $POOL has $UP_COUNT members up" >> /var/log/pool_monitor.log

if [ "$UP_COUNT" -lt "$THRESHOLD" ]; then
    echo "[$(date)] Pool DOWN: Only $UP_COUNT members up" >> /var/log/pool_monitor.log
    exit 1
else
    echo "[$(date)] Pool UP: $UP_COUNT members up" >> /var/log/pool_monitor.log
    echo "Pool is healthy" 
    exit 0
fi