Health state of the network endpoint determined based on the
health checks configured.
Values:
UNDEFINED_HEALTH_STATE (0):
A value indicating that the enum field is not
set.
DRAINING (480455402):
Endpoint is being drained.
HEALTHY (439801213):
Endpoint is healthy.
UNHEALTHY (462118084):
Endpoint is unhealthy.
UNKNOWN (433141802):
Health status of the endpoint is unknown.