Apache Status Scoreboard

Which of the following keys shows healthy conditions of the apache status ?

&_& Waiting for Connection
&S& Starting up
&R& Reading Request
&W& Sending Reply
&K& Keepalive (read)
&D& DNS Lookup,
&L& Logging
&G& Gracefully finishing
&.& Open slot with no current process

For example:

__W__WWW_W......................................................

or

_______W__......................................................


Which keys should dominate the scoreboard ?

Michael