If you want to monitor module status, take a look at the moduleStatus and moduleStandbyStatus objects from the CISCO-STACK-MIB. In a healthy switch, the active sup will have a moduleStatus of ok(2) and a moduleStandbyStatus of active(2). The standby sup will have a moduleStatus of ok(2), and a moduleStadbyStatus of standby(3).
You can also enable module traps:
snmp-server enable traps module
And that will send moduleUp and moduleDown traps which indicate that a module's moduleStatus has transitioned from or to the ok(2) state.
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