When you deploy a NetScaler device package in Cisco ACI, the Cisco APIC reports any failures. You can view the fault reports at any level of the APIC (for example, device, tenant, EPGs, or service graph). The screen shot below shows a fault report at the device level. For more information on faults, see http://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/faults/guide/b_APIC_Faults_Errors/b_IFC_Faults_Errors_chapter_01.html.
Select any APIC entity and click the Faults tab to display the faults reported by the APIC for that entity.