Aruba Networks [I-D.ietf-cats-oam-fw] defines a framework for Operations, Administration, and Maintenance (OAM) in Computing-Aware Traffic Steering (CATS) networks, introducing Instance OAM and Service OAM as new components alongside traditional Link and Path OAM, and specifying high-level requirements (O-REQ, A-REQ, M-REQ) for each. As with the base CATS work, where [I-D.ietf-cats-usecases-requirements] separately catalogued problem statement, use cases, and requirements alongside [I-D.ietf-cats-framework], the OAM framework similarly benefits from a companion document grounding its requirements in concrete operator scenarios. This document fills that gap. It presents five use cases for CATS OAM -- multi-domain compute-node failure detection, SLA verification that closes the loop with metric-driven traffic- steering decisions, demarcation of network-path faults from compute-instance faults, OAM-triggered fallback steering, and multi-vendor Compute-Service Metric Agent (C-SMA) interoperability verification -- and maps each to the Link/Path/Instance/Service OAM layering and O-REQ/A-REQ/M-REQ requirement categories defined in [I-D.ietf-cats-oam-fw].