> ## Documentation Index > Fetch the complete documentation index at: https://panaptico.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Verify System Modernization with Behavioral Baselines > Capture legacy system baselines and verify modernized systems match them. Catch schema drift, latency regressions, and dependency changes that tests miss. System modernization is often a leap of faith: you replace a legacy system, run functional tests, and hope nothing important changed. Panaptico captures the behavioral baseline of the legacy system and continuously verifies the modernized system against it, so you catch what tests miss. ## The problem Functional tests pass but production behavior diverges. Schema drift breaks downstream consumers. Latency regressions degrade user experience. Dependencies change in ways the new system depends on differently. Teams discover these gaps after rollout, when remediation is expensive and customer trust is at risk. ## How Panaptico approaches it Panaptico treats modernization as a verifiable equivalence program: * **Baseline capture** — System Sensors inventory the legacy system field by field: accounts, devices, policies, configs, relationships, and dependencies. The Atlas maps the full context so you know what the legacy system actually depended on, not what the documentation claims. Signals turn raw telemetry into scored business meaning with full history. * **Equivalence verification** — The modernized system is continuously compared against the legacy baseline. Signals detect schema drift, latency regressions, and changed dependencies. Conformity checks confirm configs match approved templates. Relationship verifies that dependency structures are preserved or intentionally changed. * **Divergence handling** — When reality slips from the baseline, Routing triggers action: risky patterns flag review, non-compliant configs block promotion, failing probes halt rollout. Gaps become work items with owners. Fixes are re-verified automatically. * **Evidence preservation** — Every comparison, signal, and probe result lands in your lake with full history. Modernization completion is evidenced, not asserted. Audit and compliance teams get scope, coverage, freshness, and inspectable proof. Initiatives package modernization as a living program scored against the live estate on every poll. Trajectory tracks progress against the program deadline. Executives see initiative scores. Platform engineers see which signals are diverging. ## What you get Confidence that the modernized system behaves like the legacy system where it matters, with proof for what changed intentionally. SREs catch regressions before users do. Platform engineers have data to defend go or no-go decisions. Auditors see full history and evidence. ## Related platform capabilities Turn raw telemetry into scored, continuously verified business meaning. Live map of entities, relationships, dependencies, and ghosts. When reality slips, trigger action through your existing tools.