just query the standard mib: .1.3.6.1.2.1.25.3.3.1.2

snmpwalk -v 2c -c public 192.168.2.112 .1.3.6.1.2.1.25.3.3.1.2
SNMPv2-SMI::mib-2.25.3.3.1.2.196608 = INTEGER: 100

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.1.3.6.1.2.1.25.3.3.1.2 in detail:
1 iso
3 identified-organization, org, iso-identified-organization
6 dod
1 internet
2 mgmt
1 mib-2, mib
25 host, hostResourcesMibModule
3 hrDevice
3 hrProcessorTable
1 hrProcessorEntry
2 hrProcessorLoad

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see also:
https://oidref.com/1.3.6.1.2.1.25.3.3.1.2

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