h</code> monitors the behavior the members of a
distributed system namely 
application VMs that may host {@link org.apache.geode.cache.Cache
cache} instances.  There are three levels of health: {@linkplain
org.apache.geode.admin.GemFireHealth#GOOD_HEALTH good health} that
indicates that all GemFire components are behaving reasonably,
{@linkplain org.apache.geode.admin.GemFireHealth#OKAY_HEALTH okay
health} that indicates that one or more GemFire components is slightly
unhealthy and may need some attention, 