RustyTorch++ — Phase 9 Plan (Global Multi‑Tenant Platform & Federated Operations)

Phase 9 focus: Turn RustyTorch++ into a planet‑scale, multi‑tenant AI platform with global routing, quota/billing, privacy‑preserving federation, and hardened compliance. Build for reliability, cost efficiency, and policy‑driven operations across Stratoswarm regions.

Reference paths

RUSTYTORCH_ROOT: /home/osobh/projects/rustytorch

RUSTG_COMPILER: /home/osobh/projects/rust/rustg (RTX 5090, sm_120)

STRATOSWARM_ROOT: /home/osobh/projects/stratoswarm

1. Scope & Non‑Goals

In scope

Multi‑Region Orchestration: active‑active regions with global traffic steering, latency‑aware routing, and regional failover.

Multi‑Tenant Isolation: per‑tenant quotas, priority lanes, resource isolation (GPU pools, namespace, secrets).

Billing & Quotas: usage metering (tokens/sec, GPU‑seconds, storage), plans, soft/hard limits, and cost attribution.

Federated Ops & Privacy: opt‑in cross‑org federation with privacy budgets (DP), redaction, and policy enforcement.

Compliance & Audit: data residency, access logs, immutable audit trails, retention & deletion SLAs.

Global Model/Artifact Distribution: signed AOT graph + kernel bundles, cache invalidation, pre‑warm across POPs.

SRE Hardening: SLOs per class/tenant, chaos & DR drills, runbooks, auto‑remediation.

Out of scope

New compiler/runtime features (covered in earlier phases) unless required for policy/isolation.

2. Success Criteria (Exit / Phase‑Gate)

Reliability: Regional SLO ≥ 99.95% with < 5 minutes RTO for single‑region failure; global traffic drains within 60s.

Isolation: No tenant cross‑impact under load and during chaos tests; per‑tenant SLOs honored.

Cost & Quotas: Accurate metering (<1% error), policy enforcement (no overages beyond configured buffers), cost dashboards.

Compliance: Residency & retention policies verifiably enforced; complete audit trail for access & model deployments; signed releases everywhere.

Performance: Global P95 latency within 1.3× of single‑region baselines for targeted models.

3. Architecture Work

A. Global Control Plane

Region registry, health and capacity discovery, feature flags per region.

Traffic director: latency‑based routing, geo‑fencing, weighted canary.

Rollout manager: blue/green + canary per region; staged kernel/AOT bundle distribution.

B. Tenant Plane

Namespaces and GPU pool isolation; per‑tenant KV cache spaces; per‑tenant scheduler lanes.

Quota manager: GPU‑seconds, request QPS, storage; soft/hard limits; backpressure & brownout policies.

Billing/metering pipeline: signed usage records; export to data warehouse.

C. Federation & Privacy

Federated execution policies: which ops/models can run cross‑org; encrypted channels; DP budget accounting.

Redaction services for logs/traces; PII scanners; right‑to‑forget hooks.

D. Compliance & Audit

Residency policies: region‑pinned storage and compute; policy linter in CI for manifests.

Immutable audit log with tamper‑evident signatures; access justifications.

E. Artifact Distribution

Global cache for AOT graphs/kernels; signed manifests; compatibility checks ({arch, driver, rustg_sha}) before activation.

Pre‑warming & eviction strategies; region‑aware cache hit targets.

F. SRE & DR

DR tiers (cold/warm/hot); runbooks; auto‑remediation playbooks (node drain, cache rebuild, failover).

Chaos injectors (region blackhole, GPU partition failure, NIC flap) in staging.

4. APIs & Configuration

tenant.configure({quota:{gpu_sec,qps,storage}, lanes:{realtime,standard,bulk}, residency:{region}})

federation.configure({allowlist, dp_budget, redaction:{pii_scanners}, encryption:true})

global.rollout({artifact, regions, strategy:{canary, blue_green}, verify:{SLO, error_budget}})

5. Benchmarks & Drills

Latency tests: geo‑distributed clients hitting nearest POP; p50/p95/p99; warm vs. cold cache.

Load isolation: hammer one tenant; verify others’ SLOs.

DR drills: region failover, cache rebuild, model rollback.

Billing accuracy: synthetic usage vs. metered records.

6. CI/CD & Policy Gates

Policy Gate: manifests pass residency/tenancy linters; SBOM + signatures required.

SLO Gate: per‑tenant/region SLO simulations; reject configs that violate budgets.

Billing Gate: metering sanity checks; duplicate detection.

Distribution Gate: artifact signatures & compatibility verified before activate.

7. Observability & Dashboards

Global view: region health, capacity, error budgets, failover state.

Tenant view: usage, quotas, SLOs, spend forecasts, cache hit rates.

Federation view: DP budgets, cross‑org flows, redactions.

Artifact view: AOT/Kernel cache hit %, version distribution, rollout status.

8. Deliverables

Global control plane (routing, rollout, health, flags).

Tenant isolation & quota manager with billing/metering pipeline.

Federation & privacy services with DP budget accounting and redaction.

Compliance toolkit: residency linter, audit log, signed artifacts.

Artifact CDN/cache for AOT graphs & kernels.

SRE package: DR runbooks, chaos injectors, auto‑remediations.

Docs & playbooks: multi‑region ops, tenant onboarding, billing, compliance.

9. RACI — Phase 9 Agent Ownership

Conductor (Orchestrator) — Accountable: cross‑workstream delivery, gate readiness.

SRE Engineer — Responsible: SLOs, DR, chaos, runbooks, auto‑remediation.

Inference Scheduler Agent — Responsible: per‑tenant lanes, isolation, admission.

DevOps Engineer — Responsible: global rollout pipelines, artifact distribution.

Security Engineer & Auditor — Accountable: privacy/redaction, encryption, secret hygiene.

Governance & Provenance Agent — Accountable: signed artifacts, audit trails, policy enforcement.

Ecosystem/Interop Agent — Consulted: SDK changes for multi‑region endpoints, client routing.

Performance Engineer — Consulted: latency modeling, cache warm strategies.

Agent Organizer — Accountable: policy routing, tool allowlists, freeze on gate failures.

10. Risks & Mitigations

Noisy neighbor effects → strict quotas, hard isolation, brownout strategies.

Billing disputes → cryptographically signed usage records; customer‑visible metering.

Compliance drift → CI policy linter; periodic audits; auto‑alerts on violations.

Global cache staleness → signed manifests + version skew checks; progressive rollout.

Failover surprises → regular DR drills; synthetic traffic during failover.