of a CPU has changed.  This indicates that a CPU's
temperature has raised to a warning or error level or that it has
dropped from a warning/error level back to a normal level.

A USB key status change has been detected

to drive diagnostics, a boot drive may need to be replaced,
as it is nearing the end of its lifespan.

 of a network interface has changed.  This indicates that
the status has changed from good to bad (e.g. from active to
no carrier) or bad from to good (e.g. from no carrier to active).
This could be caused by a faulty port on the switch or on the
server, a bad cable, an unplugged cable, or some other issue.

 of a boot drive has changed.  This indicates that a system
boot drive's status has changed from good to bad or bad to good.
This could indicate that the drive needs to be replaced.

 of a data drive has changed.  This indicates that a data
drive's status has changed from good to bad or bad to good.
This could indicate that the drive needs to be replaced.

 of a fan has changed.  This indicates that a fan's
status has changed from good to bad or bad to good.
This could indicate that the fan needs to be replaced.

 of a storage pool has changed.  This indicates that
the status has changed from good to bad (e.g. a pool that is now
degraded), bad from not as bad (e.g. a pool that has had a failed
drive replaced and is now rebuilding) or bad to good (e.g. a pool
has finished rebuilding).

 of a power supply has changed.  This indicates that a
powers supply's status has changed from good to bad or bad to good.

A scheduled Auto Support Log (ASL) has been sent.

ater mark threshold of a pool has been crossed.  This
indicates that the high water mark has either exceeded (bad), or
fallen below (good) the user set high water mark.