Problem:

Appears that the MIB for the SNMP adapter is not included in the tar ball for the subscribers edition

vero:Downloads$ tar zxvf mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1.tgz
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/GNU-AGPL-3.0
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/README
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/THIRD-PARTY-NOTICES
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongodump
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongorestore
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongoexport
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongoimport
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongostat
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongotop
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongooplog
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongofiles
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/bsondump
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongoperf
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongod
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongos
x mongodb-linux-x86_64-subscription-ubuntu1104-2.2.1/bin/mongo

vero:Downloads$ tar zxvf mongodb-linux-x86_64-subscription-amzn64-2.2.1.tgz
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/GNU-AGPL-3.0
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/README
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/THIRD-PARTY-NOTICES
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongodump
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongorestore
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongoexport
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongoimport
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongostat
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongotop
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongooplog
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongofiles
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/bsondump
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongoperf
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongod
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongos
x mongodb-linux-x86_64-subscription-amzn64-2.2.1/bin/mongo

vero:Downloads$ tar zxvf mongodb-linux-x86_64-subscription-rhel62-2.2.1.tgz
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/GNU-AGPL-3.0
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/README
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/THIRD-PARTY-NOTICES
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongodump
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongorestore
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongoexport
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongoimport
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongostat
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongotop
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongooplog
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongofiles
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/bsondump
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongoperf
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongod
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongos
x mongodb-linux-x86_64-subscription-rhel62-2.2.1/bin/mongo

Solution:
Packed the MIB in the tar ball