v0.15.5: Fix startup hub report — Push() returns real errors, startup retries 3x with 15s delay

controller/cmd/controller/main.go

@@ -290,10 +290,20 @@ func main() {
 		if hubPusher != nil {
 			if cfg.Hub.Enabled {
 				r := report.BuildReport(cfg, stackMgr, backupMgr, cpuCollector, metricsStore, Version, sett.GetStoragePaths())
-				if err := hubPusher.Push(r); err != nil {
-					logger.Printf("[WARN] Startup hub report failed: %v", err)
-				} else {
-					logger.Println("[INFO] Startup hub report sent")
+				var pushErr error
+				for attempt := 1; attempt <= 3; attempt++ {
+					pushErr = hubPusher.Push(r)
+					if pushErr == nil {
+						logger.Println("[INFO] Startup hub report sent")
+						break
+					}
+					logger.Printf("[WARN] Startup hub report attempt %d/3 failed: %v", attempt, pushErr)
+					if attempt < 3 {
+						time.Sleep(15 * time.Second)
+					}
+				}
+				if pushErr != nil {
+					logger.Printf("[WARN] Startup hub report failed after 3 attempts — next scheduled push in %s", cfg.Hub.PushInterval)
 				}
 			} else {
 				// Send a minimal "disabled" notification so hub knows reporting is intentionally off