docs(architecture): inventory global state migration (#4028)

docs/architecture/global-state-crate-split-plan.md

@@ -9,6 +9,9 @@ the root facade and into explicit owner-local boundaries. Future work should
 therefore treat broad fallback removal as complete and use this document for the
 remaining ECStore-owned bootstrap state and crate-split decisions.
 
+The issue #730 global-state baseline and runtime migration target inventory are
+recorded in [`global-state-inventory.md`](global-state-inventory.md).
+
 ## Remaining Global Owners
 
 | Owner | Current role | Migration stance |

docs/architecture/global-state-inventory.md

@@ -0,0 +1,80 @@
+# Global State Inventory
+
+This inventory records the issue #730 baseline for global runtime state after
+the AppContext foundation and owner-local runtime-source boundaries were added.
+It is intentionally documentation-only: it classifies migration targets without
+changing startup, readiness, object IO, lifecycle, replication, or notification
+behavior.
+
+## Counting Baseline
+
+The audit uses the current workspace Rust sources and keeps broad static
+caches separate from runtime migration targets.
+
+| Scope | Count | Command |
+|---|---:|---|
+| Rust source files | 1,237 | `rg --files -g '*.rs'` |
+| `OnceLock` references | 221 lines | `rg -n --glob '*.rs' 'OnceLock'` |
+| `GLOBAL_*` references | 302 lines | `rg -n --glob '*.rs' '\bGLOBAL_[A-Za-z0-9_]*\b'` |
+| `static NAME:` definitions | 621 lines | `rg -n --glob '*.rs' '^\s*(pub(\([^)]*\))?\s+)?static(\s+mut)?\s+[A-Za-z_][A-Za-z0-9_]*\s*:'` |
+| `lazy_static!` `static ref` definitions | 59 lines | `rg -n --glob '*.rs' '^\s*(pub\s+)?static\s+ref\s+[A-Za-z_][A-Za-z0-9_]*\s*:'` |
+| `static mut` definitions | 0 lines | `rg -n --glob '*.rs' '^\s*(pub(\([^)]*\))?\s+)?static\s+mut\s+'` |
+
+## Global State Classification
+
+| Category | Rule | Representative owners |
+|---|---|---|
+| Process-global | Process identity, metrics registries, lock manager, audit guard, TLS material, or other state that is intentionally one per process. | `crates/credentials`, `crates/common`, `crates/io-metrics`, `crates/lock`, `crates/obs`, `crates/tls-runtime` |
+| Runtime migration target | Mutable runtime state that describes the active object store, endpoints, local disks, lifecycle, replication, notification, config, or background controllers. | `crates/ecstore/src/runtime/global.rs`, `crates/ecstore/src/runtime/sources.rs`, `rustfs/src/app/context/*` |
+| Owner-local compatibility | Existing compatibility adapters that are allowed to read globals while callers migrate to AppContext-first or owner-local runtime-source APIs. | `rustfs/src/*/runtime_sources.rs`, `rustfs/src/*/storage_api.rs`, `crates/*/storage_api.rs` |
+| Test or fixture state | Static setup used by tests to amortize expensive ECStore setup or isolate compatibility harness state. | `rustfs/src/app/*_test.rs`, `crates/scanner/tests/*`, `crates/ecstore/src/**/tests` |
+| Cache or constant | Regexes, metrics descriptors, defaults, KVS registrations, headers, path constants, and small process caches that are not runtime ownership handles. | `crates/config`, `crates/obs/src/metrics`, `crates/utils`, `rustfs/src/server/readiness.rs` |
+| Legacy naming or review-needed | Mixed-case `GLOBAL_*`, old MinIO-port naming, stale comments, or names that need owner confirmation before code movement. | `GLOBAL_IsErasure`, `GLOBAL_Endpoints`, `GLOBAL_LocalNodeName`, `globalDeploymentIDPtr` |
+
+## Runtime Migration Inventory
+
+These are the issue #730 targets that should remain visible until an owner
+migration PR removes or replaces each item.
+
+| State | Current boundary | Category | Migration stance |
+|---|---|---|---|
+| `APP_CONTEXT_SINGLETON` | `rustfs/src/app/context/global.rs` | Owner-local compatibility | Keep as the context-first facade while no-context startup and embedded callers still exist. |
+| `GLOBAL_OBJECT_API`, `GLOBAL_OBJECT_STORE_RESOLVER` | `crates/ecstore/src/runtime/global.rs` | Runtime migration target | Do not migrate first; it is tied to storage startup, IAM-after-storage AppContext publication, and data-plane resolver compatibility. |
+| `GLOBAL_Endpoints`, `GLOBAL_IsErasure`, `GLOBAL_IsDistErasure`, `GLOBAL_IsErasureSD`, `GLOBAL_RootDiskThreshold` | `crates/ecstore/src/runtime/global.rs` and `crates/ecstore/src/runtime/sources.rs` | Runtime migration target | Move only after endpoint, setup-type, and root-disk-threshold ownership can be tested without changing readiness or quorum behavior. |
+| `GLOBAL_LOCAL_DISK_MAP`, `GLOBAL_LOCAL_DISK_ID_MAP`, `GLOBAL_LOCAL_DISK_SET_DRIVES` | `crates/ecstore/src/runtime/global.rs` and `crates/ecstore/src/runtime/sources.rs` | Runtime migration target | Needs an ECStore local-disk registry handle before code movement; preserve disk lookup, remote/local classification, and test reset hooks. |
+| `GLOBAL_ExpiryState`, `GLOBAL_TransitionState`, `GLOBAL_LifecycleSys` | `crates/ecstore/src/bucket/lifecycle/*` and `crates/ecstore/src/runtime/sources.rs` | Runtime migration target | First code-bearing candidate is `GLOBAL_ExpiryState`, because AppContext already has an `ExpiryStateInterface`, resolver, and tests. |
+| `GLOBAL_REPLICATION_POOL`, `GLOBAL_REPLICATION_STATS`, `GLOBAL_BUCKET_MONITOR` | `crates/ecstore/src/bucket/replication/*`, `crates/ecstore/src/runtime/global.rs` | Runtime migration target | Keep behind AppContext replication and bucket-monitor resolvers until queue admission, stats, and admin reporting coverage are explicit. |
+| `GLOBAL_TierConfigMgr`, `GLOBAL_STORAGE_CLASS`, `GLOBAL_CONFIG_SYS`, `GLOBAL_SERVER_CONFIG` | `crates/ecstore/src/config`, `crates/config`, `rustfs/src/app/context/runtime_sources.rs` | Runtime migration target | Move through config/runtime-source owners only; do not combine with storage-class behavior or persistence changes. |
+| `GLOBAL_EventNotifier`, `GLOBAL_NotificationSys` | `crates/ecstore/src/services/*` | Runtime migration target | Preserve notification and audit side effects; move only through notify/runtime-source boundaries. |
+| `GLOBAL_BOOT_TIME`, `globalDeploymentIDPtr`, `GLOBAL_REGION`, `GLOBAL_RUSTFS_PORT`, `GLOBAL_LocalNodeName` | `crates/ecstore/src/runtime/global.rs` | Runtime migration target | Scalar handles may migrate in small PRs after call sites use AppContext or owner-local runtime-source readers. |
+| `GLOBAL_LOCAL_LOCK_CLIENT`, `GLOBAL_LOCK_CLIENTS`, `GLOBAL_LOCK_MANAGER` | `crates/ecstore/src/runtime/global.rs`, `crates/lock` | Runtime migration target / process-global split | Preserve lock quorum and lock client selection; keep process-level lock manager separate from ECStore endpoint-specific clients. |
+| `GLOBAL_CONN_MAP`, `GLOBAL_RUSTFS_HOST`, `GLOBAL_RUSTFS_ADDR`, `GLOBAL_ROOT_CERT`, `GLOBAL_MTLS_IDENTITY`, `GLOBAL_OUTBOUND_TLS_GENERATION` | `crates/common`, `crates/tls-runtime`, `crates/ecstore/src/runtime/sources.rs` | Runtime migration target / process-global split | Migrate only after internode transport and outbound TLS ownership are explicit; do not change cached channel reuse or TLS reload semantics. |
+| `GLOBAL_HEAL_MANAGER`, `GLOBAL_HEAL_CHANNEL_PROCESSOR`, `GLOBAL_AHM_SERVICES_CANCEL_TOKEN` | `crates/heal` and `crates/common` | Runtime migration target | Needs heal runtime owner handles and queue tests; do not combine with ECStore disk-state movement. |
+| `AUDIT_SYSTEM`, `GLOBAL_CAPACITY_MANAGER`, `GLOBAL_BUCKET_TARGET_SYS`, `GLOBAL_PROCESSORS`, `INTERNODE_DATA_TRANSPORT`, `GLOBAL_KMS_SERVICE_MANAGER` | Owner crates | Runtime migration target / process-global split | Track as owner-specific follow-ups; each owner must decide whether AppContext, a runtime-source facade, or process-global state is the right final shape. |
+
+## First Code-Bearing Candidate
+
+`GLOBAL_ExpiryState` is the safest first runtime migration candidate:
+
+- AppContext already exposes `ExpiryStateInterface` and resolver coverage in
+  `rustfs/src/app/context.rs`.
+- ECStore access is already concentrated in
+  `crates/ecstore/src/runtime/sources.rs`.
+- The main external readers can be moved through storage/observability facades
+  before changing lifecycle queue ownership.
+
+Do not migrate `GLOBAL_OBJECT_API` first. It is coupled to storage startup,
+object-store resolver publication, IAM-after-storage AppContext initialization,
+and broad data-plane compatibility.
+
+## Verification
+
+Inventory and guardrail PRs should run:
+
+- `bash -n scripts/check_architecture_migration_rules.sh`
+- `./scripts/check_architecture_migration_rules.sh`
+- `cargo fmt --all --check`
+- `git diff --check`
+
+Code-bearing migration PRs must add focused tests for the owner being moved
+before running broader gates.

docs/architecture/runtime-lifecycle.md

@@ -113,3 +113,8 @@ address normalization, and process-local shutdown cleanup.
 Early AppContext work should split resolver files and add compatibility tests before
 boot extraction or consumer migration. This keeps the migration context-first while
 preserving the old global fallback path during transition.
+
+AppContext remains a context-first facade, not a full replacement for every
+process global. New migration work must keep fallback reads inside owner-local
+runtime-source boundaries and follow the global-state target inventory in
+[`global-state-inventory.md`](global-state-inventory.md).

scripts/check_architecture_migration_rules.sh

@@ -67,6 +67,10 @@ require_source_contains "docs/architecture/global-state-crate-split-plan.md" "##
 require_source_contains "docs/architecture/global-state-crate-split-plan.md" "## Fallback Removal Plan" "global state plan fallback section"
 require_source_contains "docs/architecture/global-state-crate-split-plan.md" "## Crate Split Evaluation" "global state plan crate split section"
 require_source_contains "docs/architecture/global-state-crate-split-plan.md" "rustfs_ecstore::api::global" "global state plan facade boundary"
+require_source_contains "docs/architecture/global-state-crate-split-plan.md" "global-state-inventory.md" "global state inventory plan link"
+require_source_contains "docs/architecture/global-state-inventory.md" "## Global State Classification" "global state inventory classification section"
+require_source_contains "docs/architecture/global-state-inventory.md" "## Runtime Migration Inventory" "global state inventory migration section"
+require_source_contains "docs/architecture/global-state-inventory.md" "GLOBAL_ExpiryState" "global state inventory first candidate"
 require_source_contains "docs/architecture/obs-ecstore-dependency-inventory.md" "## Dependency Inventory" "observability ECStore dependency inventory section"
 require_source_contains "docs/architecture/obs-ecstore-dependency-inventory.md" "## Extraction Plan" "observability ECStore extraction plan section"
 require_source_contains "docs/architecture/obs-ecstore-dependency-inventory.md" "crates/obs/src/metrics/storage_api.rs" "observability ECStore storage_api boundary"