A search in the Domino Administrator Help for MIB should give you the information you’re after.
This is just one of them…
The Domino Management Information Base (MIB) covers only the Domino server and not any other IBM or third-party server add-ins. The branch (object ID) is named:
The main branches in numeric order are as follows:
lnInfo – Information about the server provided by the QuerySet server add-in task. This includes values and sub-branches. The main sub-branch is lnStats, which contains the Domino statistics organized into sub-branches that mirror the Domino statistics branches. For example, the Server.* Domino statistics are in the lnServer sub-branch. Comments with these objects, beginning with the string “–<<”, indicate which Domino statistic an object is derived from.
lnControl – Values provided by LNSNMP including those monitoring and controlling the server.
lnInterceptor – An internal branch relating to the Event Interceptor add-in task.
lnUnix – An internal branch that supports for NetView for AIX.
lnMPAInfo – A branch with one value provided by LNSNMP that gives the version of the Domino SNMP Agent.