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ARTICLELearn › Blog › SREYour 3am alarm started with a silent drift.The incident didn't start at 3am. It started three sprints ago, when an AI agent crossed a service boundary nobody reviewed. Technical debt is visible. Architectural drift is invisible — until 3am.CONCEPTLearn › Concepts › PlatformArchitectural DriftThe silent, incremental divergence between agreed architectural intent and what actually ships — now accelerating as AI coding tools multiply PR volume beyond review capacity.METRICLearn › Metrics › L2PDT · Pillar Drift TrendIs a domain getting better or worse sprint-over-sprint?METRICLearn › Metrics › L3UDR · Ungoverned Drift Rate% of structural changes with no approved Change Intention.METRICLearn › Metrics › L3ADI · Architecture Drift IndexNormalised 0.0–1.0 measure of drift severity.METRICLearn › Metrics › L5ADRIFT · Agent-Introduced Drift Rate% of agent PRs that produced ungoverned drift.CONCEPTLearn › Concepts › Architecture LedgerArchitectural DebtArchitectural debt is two things — the drift that crept in silently and the risk your team approved knowingly — and today only one of them has an owner or a cost.METRICLearn › Metrics › L2PDRP · PR Degradation Rate per PillarIs drift concentrated in one team or systemic?GUIDELearn › Guides › CTOCTO Architecture Health PlaybookA CTO's weekly check on architecture health, board-ready DHS reporting, AI adoption governance via ADRIFT, and knowing when to escalate.GUIDELearn › Guides › VP EngVP Engineering PlaybookHow VPs of Engineering track sprint conformance, team-level drift, and quarterly process health using DCS, IFR, PDT, and PDRP signals.GUIDELearn › Guides › SRESRE Operational PlaybookHow SREs use UDR and ADRIFT as pre-incident signals, trace architectural root cause after an incident, and monitor AGVR governance bypass.ROLELearn › Pages › VP EngVPs of EngineeringSprint conformance, team-level drift and process health.ROLELearn › Pages › SRESREsArchitectural risk, incident root cause and agent drift signals.