RECOVERED alerts red->yellow

I have the following settings in my hobbitserver.cfg: ALERTCOLORS="red,yellow,purple" OKCOLORS="green,blue,clear"

I have the following rule in my hobbit-alerts.cfg: SERVICE=disk COLOR=red MAIL asparks at photobucket.com RECOVERED

I get an alert when disk space goes critical (red). However:

• when the status goes from red->green, I get a recovery alert;
• when the status goes red->yellow->green, I get NO recovery alert.

I've read the sections on ALERTCOLORS and OKCOLORS. It does work better when I remove yellow from the list. But I need to sometimes alert on yellow status, so this is not really an option.

What have I done wrong? Thanks in advance. -Alan