This object records the exact OID of the managed object instance for which a specific rule failed, copying the value of that rule's checkRuleOid at the moment of failure. An admin drilling from a failing check down into checkFailureTable uses this to see precisely which object and instance triggered the failure, especially important when the originating checkRuleOid was a columnar OID applied across many instances, since this field resolves it down to the specific instance that actually failed. If a rule was configured against the columnar OID ifInErrors, applying to all interfaces, and interface 12 crossed the threshold, this object would report ifInErrors.12, identifying the specific failing interface.