MTBF (Mean Time Between Failures) sandbox utility has been around since R5.
The down time reported for crashes works fine, but the down time reported for server shutdowns is not working in Domino 8. It typically reports 0 minutes down and occasionally a value of at or near max Int (65525, 65512, etc)
This product is one of those "as-is" things, but it would be nice if it were updated to work with the current software. There is no formal way of reporting this, though I did call and report it through IBM Support. (the analyst said he would let the developers know when he met with them, but had to close the ticket.)
Please vote this one up and if you aren't using it, go check out this great statistical tool to track your server availability automagically in the developer works sandbox. Also, the following text comes from the Help About document. If you know John, let him know he made a great tool and ask him to tweak it for ND8.x.
Mean Time Between Failure
for Lotus Notes/Domino
Written 1995-2000 by John Paganetti, Iris Associates, Inc.
(C) 1995-2000 by John Paganetti, Iris Associates All rights reserved.