RFC 3815 defines MPLS-LDP-GENERIC-STD-MIB. This MIB contains managed object definitions for configuring and monitoring the Multiprotocol Label Switching (MPLS) and Label Distribution Protocol (LDP).
The OID of root objects is:
iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).transmission(10).mplsStdMIB(166).mplsLdpGenericStdMIB(7)