Status of last health check, one of:
UNK     -> unknown
INI     -> initializing
SOCKERR -> socket error
L4OK    -> check passed on layer 4, no upper layers testing enabled
L4TOUT  -> layer 1-4 timeout
L4CON   -> layer 1-4 connection problem, for example "Connection refused" (tcp rst) or "No route to host" (icmp)
L6OK    -> check passed on layer 6
L6TOUT  -> layer 6 (SSL) timeout
L6RSP   -> layer 6 invalid response - protocol error
L7OK    -> check passed on layer 7
L7OKC   -> check conditionally passed on layer 7, for example 404 with disable-on-404
L7TOUT  -> layer 7 (HTTP/SMTP) timeout
L7RSP   -> layer 7 invalid response - protocol error
L7STS   -> layer 7 response error, for example HTTP 5xx
Notice: If a check is currently running, the last known status will be reported, prefixed with "* ". e. g. "* L7OK".