Possible values:
UP - The server is reporting as healthy.
DOWN - The server is reporting as unhealthy and unable to receive requests.
NOLB - You've added http-check disable-on-404 to the backend and the health checked URL has returned an HTTP 404 response.
MAINT - The server has been disabled or put into maintenance mode.
DRAIN - The server has been put into drain mode.
no check - Health checks are not enabled for this server.