fix: skip stopped apps in telemetry to avoid zero-value averages on hub

Deployed-but-stopped apps were included in telemetry reports with all-zero
memory/CPU values, dragging down hub-side averages. Now isStackRunning()
filters to only running/starting/unhealthy/restarting states.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,10 @@
 ## Changelog
 
+### v0.28.4 — Telemetry: Skip Stopped Apps (2026-02-23)
+
+#### Fixed
+- **Stopped apps no longer send zero-value telemetry to hub** (`report/telemetry.go`) — Previously, deployed-but-stopped apps were included in the telemetry report with all-zero memory/CPU values, which dragged down hub-side averages. Now `buildAppTelemetry` checks `isStackRunning()` and only includes apps in running, starting, unhealthy, or restarting states.
+
 ### v0.28.3 — Catch-All Page, Deploy Controls, Dashboard Open (2026-02-23)
 
 #### Added

controller/internal/report/telemetry.go

@@ -27,7 +27,7 @@ func buildAppTelemetrySection(stackMgr *stacks.Manager, metricsStore *metrics.Me
 	// 2. Collect non-protected container names for log scan
 	var containerNames []string
 	for _, s := range allStacks {
-		if s.Protected || !s.Deployed {
+		if s.Protected || !s.Deployed || !isStackRunning(s.State) {
 			continue
 		}
 		for _, c := range s.Containers {
@@ -58,7 +58,7 @@ func buildAppTelemetry(allStacks []stacks.Stack, telemetry []metrics.ContainerTe
 	var result []AppTelemetry
 
 	for _, s := range allStacks {
-		if s.Protected || !s.Deployed {
+		if s.Protected || !s.Deployed || !isStackRunning(s.State) {
 			continue
 		}
 
@@ -118,6 +118,18 @@ func buildAppTelemetry(allStacks []stacks.Stack, telemetry []metrics.ContainerTe
 	return result
 }
 
+// isStackRunning returns true if the stack has containers actively running
+// (running, starting, or unhealthy but still up). Stopped, exited, deploying
+// etc. are excluded to avoid sending zero-value telemetry to the hub.
+func isStackRunning(state stacks.ContainerState) bool {
+	switch state {
+	case stacks.StateRunning, stacks.StateStarting, stacks.StateUnhealthy, stacks.StateRestarting:
+		return true
+	default:
+		return false
+	}
+}
+
 // BuildAppTelemetryForDebug runs the full telemetry collection pipeline
 // (metrics query + log scan) and returns per-app telemetry data.
 // Used by the debug endpoint to preview telemetry without pushing to hub.