The convergence of traditionally separate monitoring and defensive functions within enterprise information technology has emerged as a strategic priority in contemporary digital environments. This review examines the systematic consolidation of operational surveillance and cybersecurity workflows into unified command facilities, providing a comprehensive analysis of architectural paradigms, technological enablers, organisational structures, governance imperatives, and emerging trends. Drawing upon peer-reviewed literature and documented industry practice, the paper investigates how unified facilities enable holistic visibility across hybrid environments, accelerate incident resolution timelines, and reduce operational redundancy. Central findings indicate that such convergence yields measurable improvements in mean-time-to-detect and mean-time-to-respond metrics, streamlines governance arrangements, and fosters cross-functional expertise among analysts. The analysis further identifies critical enabling technologies, including security information and event management platforms, orchestration and automated response tools, artificial intelligence-driven anomaly detection, and cloud-native observability stacks. Persistent challenges include cultural friction between operational and security teams, tooling fragmentation, talent scarcity, and the complexity of securing converged pipelines without disrupting business continuity. The examination also interrogates governance frameworks, regulatory obligations, and ethical considerations surrounding data sovereignty, privileged access, and automated decision-making. Looking forward, the paper forecasts the trajectory of these facilities as they incorporate machine learning, zero-trust architectures, extended detection and response capabilities, and emerging quantum-safe cryptography paradigms. Practical recommendations are offered for enterprises at various stages of convergence maturity, emphasising phased integration, sustained investment in workforce development, and robust measurement frameworks. The analysis underscores that unified facilities, when implemented with strategic clarity and disciplined execution, transform reactive postures into anticipatory defence capabilities essential for contemporary digital ecosystems, offering sectoral applicability across finance, energy, healthcare, telecommunications, and public administration.