diff --git a/server/handlers/admin_metrics_test.go b/server/handlers/admin_metrics_test.go
index 268efa4..0285dbe 100644
--- a/server/handlers/admin_metrics_test.go
+++ b/server/handlers/admin_metrics_test.go
@@ -28,6 +28,7 @@ func TestMetrics_SQLiteShape(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 
 	collector := metrics.NewCollector(
+		"test-node",
 		nil, // no DB
 		&mockHub{count: 5},
 		&mockBus{pub: 10, del: 20},
@@ -54,6 +55,11 @@ func TestMetrics_SQLiteShape(t *testing.T) {
 		t.Fatalf("unmarshal: %v", err)
 	}
 
+	// Node ID
+	if snap.NodeID != "test-node" {
+		t.Errorf("node_id = %q, want %q", snap.NodeID, "test-node")
+	}
+
 	// Runtime
 	if snap.Runtime.WSClients != 5 {
 		t.Errorf("ws_clients = %d, want 5", snap.Runtime.WSClients)
@@ -103,6 +109,7 @@ func TestMetrics_WithCluster(t *testing.T) {
 	}
 
 	collector := metrics.NewCollector(
+		"test-node",
 		nil,
 		&mockHub{count: 3},
 		&mockBus{},
@@ -147,6 +154,7 @@ func TestMetrics_ExtensionCounters(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 
 	collector := metrics.NewCollector(
+		"test-node",
 		nil,
 		&mockHub{},
 		&mockBus{pub: 100, del: 500},
diff --git a/server/main.go b/server/main.go
index 1a01ece..150a85d 100644
--- a/server/main.go
+++ b/server/main.go
@@ -201,15 +201,18 @@ func main() {
 	// ── WebSocket Hub ─────────────────────────
 	hub := events.NewHub(bus, middleware.GetAllowedOrigins(cfg))
 
+	// ── Node Identity ────────────────
+	// Used by cluster registry (PG) and metrics endpoint (all deployments).
+	nodeID := cfg.ClusterNodeID
+	if nodeID == "" {
+		hostname, _ := os.Hostname()
+		nodeID = fmt.Sprintf("%s-%d", hostname, os.Getpid())
+	}
+
 	// ── Cluster Registry ────────────
 	// PG-backed node self-registration + heartbeat. No-op on SQLite.
 	var clusterReg *cluster.Registry
 	if database.IsPostgres() && stores.Cluster != nil {
-		nodeID := cfg.ClusterNodeID
-		if nodeID == "" {
-			hostname, _ := os.Hostname()
-			nodeID = fmt.Sprintf("%s-%d", hostname, os.Getpid())
-		}
 		clusterReg = cluster.NewRegistry(nodeID, cfg.ClusterEndpoint, stores.Cluster, hub, cluster.RegistryConfig{
 			HeartbeatInterval: cfg.ClusterHeartbeatInterval,
 			StaleThreshold:    cfg.ClusterStaleThreshold,
@@ -811,7 +814,7 @@ func main() {
 
 			// ── Metrics ─────────────────
 			metricsCollector := metrics.NewCollector(
-				database.DB, hub, bus, stores,
+				nodeID, database.DB, hub, bus, stores,
 				sandbox.SandboxStats,
 				triggerEngine.FireCount,
 				startTime,
diff --git a/server/metrics/collector.go b/server/metrics/collector.go
index e7896d6..d9ffd03 100644
--- a/server/metrics/collector.go
+++ b/server/metrics/collector.go
@@ -18,6 +18,7 @@ import (
 
 // Snapshot is the top-level JSON response from GET /api/v1/admin/metrics.
 type Snapshot struct {
+	NodeID     string            `json:"node_id"`
 	Runtime    RuntimeMetrics    `json:"runtime"`
 	DB         DBMetrics         `json:"db"`
 	Cluster    *ClusterMetrics   `json:"cluster,omitempty"`
@@ -91,6 +92,7 @@ type TriggerFireCountFunc func() int64
 
 // Collector gathers metrics on demand for the admin endpoint.
 type Collector struct {
+	nodeID           string
 	db               *sql.DB
 	hub              ConnCounter
 	bus              BusCounter
@@ -101,8 +103,9 @@ type Collector struct {
 }
 
 // NewCollector creates a metrics collector with all required dependencies.
-func NewCollector(db *sql.DB, hub ConnCounter, bus BusCounter, stores store.Stores, sandboxFn SandboxStatsFunc, triggerFn TriggerFireCountFunc, startTime time.Time) *Collector {
+func NewCollector(nodeID string, db *sql.DB, hub ConnCounter, bus BusCounter, stores store.Stores, sandboxFn SandboxStatsFunc, triggerFn TriggerFireCountFunc, startTime time.Time) *Collector {
 	return &Collector{
+		nodeID:           nodeID,
 		db:               db,
 		hub:              hub,
 		bus:              bus,
@@ -115,7 +118,7 @@ func NewCollector(db *sql.DB, hub ConnCounter, bus BusCounter, stores store.Stor
 
 // Collect gathers all metrics synchronously and returns a snapshot.
 func (c *Collector) Collect(ctx context.Context) *Snapshot {
-	snap := &Snapshot{}
+	snap := &Snapshot{NodeID: c.nodeID}
 	snap.Runtime = c.collectRuntime()
 	snap.DB = c.collectDB(ctx)
 	snap.Cluster = c.collectCluster(ctx)
diff --git a/src/js/sw/surfaces/admin/health.js b/src/js/sw/surfaces/admin/health.js
index aedf441..d340566 100644
--- a/src/js/sw/surfaces/admin/health.js
+++ b/src/js/sw/surfaces/admin/health.js
@@ -121,13 +121,13 @@ function NodeCard({ node }) {
     const ageColor = node.heartbeat_age_ms < 15000 ? 'var(--accent, #2a6)' : 'var(--warning, #c80)';
 
     return html`
-        <div style="border:1px solid var(--border, #ddd);border-radius:8px;padding:12px;background:var(--bg-primary, #fff);">
-            <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;">
-                <strong style="font-size:13px;">${node.node_id}</strong>
-                <span style="font-size:11px;color:${ageColor};font-weight:600;">${ageLabel}</span>
+        <div style="border:1px solid var(--border, #ddd);border-radius:8px;padding:12px;background:var(--bg-primary, #fff);overflow:hidden;">
+            <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;gap:8px;">
+                <strong style="font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;" title=${node.node_id}>${node.node_id}</strong>
+                <span style="font-size:11px;color:${ageColor};font-weight:600;flex-shrink:0;">${ageLabel}</span>
             </div>
-            ${node.endpoint && html`<div style="font-size:11px;color:var(--text-muted, #888);margin-bottom:8px;">${node.endpoint}</div>`}
-            <div style="display:grid;grid-template-columns:repeat(3,1fr);gap:6px;">
+            ${node.endpoint && html`<div style="font-size:11px;color:var(--text-muted, #888);margin-bottom:8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">${node.endpoint}</div>`}
+            <div style="display:grid;grid-template-columns:repeat(3,1fr);gap:6px;overflow:hidden;">
                 <${Stat} label="Uptime"      value=${formatDuration(stats.uptime_sec)} />
                 <${Stat} label="WS Clients"  value=${formatNum(stats.ws_clients)} />
                 <${Stat} label="Goroutines"  value=${formatNum(stats.goroutines)} />
@@ -188,8 +188,9 @@ export default function HealthSection() {
 
     return html`
         <div>
-            <div style="display:flex;justify-content:flex-end;align-items:center;margin-bottom:16px;gap:8px;">
-                <span style="font-size:11px;color:var(--text-muted, #888);">Refresh</span>
+            <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:8px;">
+                ${data.node_id && html`<span style="font-size:11px;color:var(--text-muted, #888);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;" title=${data.node_id}>Viewing from <strong style="color:var(--text-primary, #ccc);">${data.node_id}</strong></span>`}
+                <span style="font-size:11px;color:var(--text-muted, #888);flex-shrink:0;">Refresh</span>
                 <select style="font-size:12px;padding:2px 6px;" value=${interval} onChange=${e => setInterval_(+e.target.value)}>
                     <option value="5">5s</option>
                     <option value="10">10s</option>