This object specifies the minimum interval with which the
GSLB device attempts to schedule keepalives.
It is valid when cghMonKalParameterMethod is 'cra' or 'ns'.
And also, it is valid when cghMonKalParameterMethod is
'tcp', 'icmp', 'httphead' or 'kalap', provided
cghMonKalParameterRate is 'standard'.