from the commit:

Modified two monitors:

SMTP: Changed the log messages to be more descriptive.

SNMP: Corrected the behavior of the "walk" option. It was supposed to require
that all values of the walk passed the test, but due to a poorly placed if
statement only the last value had to pass.

Add a "matchall" option. By default this is true which means all values must
pass the test, just as before (well, now that the above bug was fixed). If
set to false, then only one value must pass the test. This makes it possible
to walk a table of, say, running processes and to insure that at least one
is running.