For example, OID for CPU load for 1 minute is .22.214.171.124.4.1.2021.10.1.3.1 in Linux and Cisco router. But I'm not sure if it is just a coincidence or it is secured over various network devices. I haven't found any document which tells that OID's are defined globally, while I've found some platform-specific OID references. I guess it is, but I need a reliable source to convince myself.
The .1.3.6 MIB tree is generic except for vendor-specific MIB .126.96.36.199.4.1, not all parts of the MIB tree will be implemented by or necessarily relevant to all devices. The most common subtree is MIB-II which is anything beneath .188.8.131.52.2 or therabouts. Your OID is part of vendor-specific with vendor 2021 which seems to be some sort of host MIB.