diff --git a/docs/release-control/v6/internal/subsystems/alerts.md b/docs/release-control/v6/internal/subsystems/alerts.md
index 8170bc5161..804035b51e 100644
--- a/docs/release-control/v6/internal/subsystems/alerts.md
+++ b/docs/release-control/v6/internal/subsystems/alerts.md
@@ -61,6 +61,17 @@ own inline boundary. A wearout arm keyed on `> 0` silently exempts the single
 worst reading a disk can publish, which let a spent SSD read critical on the
 Physical Disks surface while raising no alert at all.
 
+Threshold sections are keyed by override identity, not by resource type. The
+Virtualization Hosts section reads and writes overrides on the bare resource id,
+while the Machines section resolves through the agent-derived identity
+candidates. A resource that appears in both sections therefore has two different
+override keys, and a threshold saved from the wrong one is written where
+alerting never reads it, leaving the machine on the global default with nothing
+on screen to explain it. A resource must appear in exactly one threshold section,
+the one whose identity alerting honours. Standalone Pulse-agent machines belong
+to Machines, so the Virtualization Hosts section is fed by provider-owned
+virtualization nodes rather than by every resource of type `agent`.
+
 ## Canonical Files
 
 1. `internal/alerts/specs/types.go`
diff --git a/docs/release-control/v6/internal/subsystems/frontend-primitives.md b/docs/release-control/v6/internal/subsystems/frontend-primitives.md
index 3906805ecd..636d0a2a25 100644
--- a/docs/release-control/v6/internal/subsystems/frontend-primitives.md
+++ b/docs/release-control/v6/internal/subsystems/frontend-primitives.md
@@ -31,6 +31,14 @@ inlining the boundary at each call site. `isPhysicalDiskWearoutReported` mirrors
 helpers gate on it, so a wearout reading cannot be classified one way in a
 status label and another way in the cell beside it.
 
+Feature surfaces classify resources through the shared classifier that already
+owns the distinction rather than re-deriving it from a raw resource type.
+`isPulseAgentPlatformResource` is the single authority for whether a resource is
+a standalone Pulse-agent machine or a provider-owned node, and the standalone
+page, platform navigation, the resource drawer and the alerts threshold sections
+all read it. Selecting by bare `type === 'agent'` collapses that distinction and
+puts the same machine on two surfaces that do not share an identity.
+
 ## Canonical Files
 
 1. `frontend-modern/src/components/shared/`
diff --git a/docs/release-control/v6/internal/subsystems/registry.json b/docs/release-control/v6/internal/subsystems/registry.json
index c914544a04..38673c8697 100644
--- a/docs/release-control/v6/internal/subsystems/registry.json
+++ b/docs/release-control/v6/internal/subsystems/registry.json
@@ -2256,7 +2256,8 @@
               "frontend-modern/src/features/alerts/__tests__/OverviewTab.timelineerror.test.tsx",
               "frontend-modern/src/features/alerts/__tests__/OverviewTab.total24h.test.tsx",
               "frontend-modern/src/features/alerts/__tests__/ThresholdsTab.test.tsx",
-              "frontend-modern/src/features/alerts/__tests__/useAlertDestinationsTabState.test.tsx",
+              "frontend-modern/src/features/alerts/__tests__/useAlertOverridesState.test.tsx",
+            "frontend-modern/src/features/alerts/__tests__/useAlertDestinationsTabState.test.tsx",
               "frontend-modern/src/features/alerts/AlertDeliveryHealthCard.test.tsx",
               "frontend-modern/src/features/alerts/identity.test.ts",
               "frontend-modern/src/features/alerts/thresholds/__tests__/helpers.test.ts",