[Output Only] The current detailed instance health state.
Values:
UNDEFINED_DETAILED_HEALTH_STATE (0):
A value indicating that the enum field is not
set.
DRAINING (480455402):
The instance is being drained. The existing
connections to the instance have time to
complete, but the new ones are being refused.
HEALTHY (439801213):
The instance is reachable i.e. a connection
to the application health checking endpoint can
be established, and conforms to the requirements
defined by the health check.
TIMEOUT (477813057):
The instance is unreachable i.e. a connection
to the application health checking endpoint
cannot be established, or the server does not
respond within the specified timeout.
UNHEALTHY (462118084):
The instance is reachable, but does not
conform to the requirements defined by the
health check.
UNKNOWN (433141802):
The health checking system is aware of the
instance but its health is not known at the
moment.
