Using Net-SNMP to monitor SWAP space

I have read the sections on using SWAP for monitoring swap space.  I just do
not understand in plain howto language to make this work.  Is there anybody
who can explain this in a much easier manner?

I have traps enabled but it seems like there is some thing related to DIS
MAN MIB yet my net-snmp file makes no mention of DIS MAN MIB.

So here's the information from the WIKI but it doesn't make sense to me:
swap MIN monitors the amount of swap space available on the local system. If
this falls below the specified threshold (MIN kB), then the
*memErrorSwap*object will be set to 1, and a suitable description
message reported via
*memSwapErrorMsg*.
Note: This situation will *not* automatically trigger a trap to report the
problem - see the DisMan Event MIB section later.  If this directive is not
specified, the default threshold is 16 MB. And then I see this information:

defaultMonitors yes will configure the Event MIB tables to monitor the
various UCD-SNMP-MIB tables for problems (as indicated by the appropriate
xxErrFlag column objects).
This is exactly equivalent to the configuration:
 monitor -o memErrorName -o memSwapErrorMsg "memory" memSwapError != 0
I have no idea what this means...please any help is greatly appreciated.

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