diff --git a/docs/release-control/v6/internal/subsystems/monitoring.md b/docs/release-control/v6/internal/subsystems/monitoring.md
index 98cae51d05..95abd650ac 100644
--- a/docs/release-control/v6/internal/subsystems/monitoring.md
+++ b/docs/release-control/v6/internal/subsystems/monitoring.md
@@ -27,13 +27,13 @@ projection converter. Conversion sorts final frontend rows beside precomputed
 keys instead of retaining an estate-sized array of conversion inputs. This
 must preserve canonical identity, parent/action targets, catalogs, ordering,
 ignore surfaces and source isolation. No timestamp/generation cache is added:
-metrics, labels, alert state, metadata clears and time-sensitive health continue
+metrics, tags, alert state, metadata clears and time-sensitive health continue
 to be evaluated on each requested broadcast.
 
 `TestBroadcastProjectionMatchesPreviousPipeline` compares full JSON with the
 pre-repair conversion/sort/coalesce pipeline on split hosts and mixed workloads.
 `TestBroadcastProjectionListsRegistryOnceAndKeepsLiveChanges` pins one registry
-list and verifies same-freshness metric/label changes, live alerts, ignored
+list and verifies same-freshness metric/tag changes, live alerts, ignored
 hosts and immutable prior projections. The 1,000-resource broadcast benchmark
 includes real registry cloning, projection, encoding, per-client deltas and
 queues with zero/one/four viewers, not persistence, transport or installed CPU.
diff --git a/internal/monitoring/canonical_guardrails_test.go b/internal/monitoring/canonical_guardrails_test.go
index be2f8adeb2..29ee0fb7b1 100644
--- a/internal/monitoring/canonical_guardrails_test.go
+++ b/internal/monitoring/canonical_guardrails_test.go
@@ -2921,7 +2921,7 @@ func TestBroadcastProjectionMatchesPreviousPipeline(t *testing.T) {
 	for i, name := range []string{"zebra", "Alpha", "alpha", "", "尾"} {
 		parent := "agent-api"
 		resources = append(resources, unifiedresources.Resource{
-			ID: fmt.Sprintf("vm-%d", i), Type: unifiedresources.ResourceTypeVM, Name: name, DisplayName: name,
+			ID: fmt.Sprintf("vm-%d", i), Type: unifiedresources.ResourceTypeVM, Name: name,
 			ParentID: &parent, Status: unifiedresources.StatusOnline, LastSeen: now,
 			Proxmox: &unifiedresources.ProxmoxData{NodeName: "tower.local", VMID: i + 100},
 			Sources: []unifiedresources.DataSource{unifiedresources.SourceProxmox},
diff --git a/internal/monitoring/monitor_host_agents_test.go b/internal/monitoring/monitor_host_agents_test.go
index 0232b58b56..264f4b9c4b 100644
--- a/internal/monitoring/monitor_host_agents_test.go
+++ b/internal/monitoring/monitor_host_agents_test.go
@@ -6660,9 +6660,9 @@ func TestBroadcastProjectionListsRegistryOnceAndKeepsLiveChanges(t *testing.T) {
 	oldCPU := first.Resources[0].CPU.Current
 	changed := store.GetAll()
 	// Keep LastSeen/overall freshness unchanged: a timestamp-only cache would
-	// miss these metric/status/label changes.
+	// miss these metric/status/tag changes.
 	changed[0].Metrics.CPU.Value = 77
-	changed[0].Labels = map[string]string{"new": "label"}
+	changed[0].Tags = []string{"new-tag"}
 	changed[0].Status = unifiedresources.StatusOffline
 	registry := unifiedresources.NewRegistry(nil)
 	registry.IngestResources(changed)
@@ -6680,7 +6680,7 @@ func TestBroadcastProjectionListsRegistryOnceAndKeepsLiveChanges(t *testing.T) {
 			row = &second.Resources[i]
 		}
 	}
-	if row == nil || row.CPU.Current != 77 || row.Labels["new"] != "label" {
+	if row == nil || row.CPU.Current != 77 || len(row.Tags) != 1 || row.Tags[0] != "new-tag" {
 		t.Fatalf("mutable row was stale: %#v", row)
 	}
 	if first.Resources[0].CPU.Current != oldCPU {