After reviewing telemetry from staging and a limited canary cohort, we saw early regression signals: elevated 5xx rates, transient latency spikes under burst load, and a small but persistent memory growth pattern. Several upstream/downstream dependencies still show unresolved compatibility risks, and the current change window coincides with peak research workloads, which would leave an insufficient rollback buffer per our policy. Observability and safety controls are incomplete (missing feature flags and finalized runbooks), increasing potential blast radius if issues surface in production. Postponement enables closing these gaps, finishing root-cause analysis, expanding test coverage, and rescheduling into a low-risk window with full stakeholder sign-off.