diff --git a/provider/internal/core/client.go b/provider/internal/core/client.go
index def6adb..bba7e66 100644
--- a/provider/internal/core/client.go
+++ b/provider/internal/core/client.go
@@ -568,6 +568,14 @@ type InstanceStateResponse struct {
 // FindInstanceByDisplayName finds an instance by display_name for a given serviceId.
 // Если найдено больше одного non-deleted инстанса — возвращает ошибку.
 func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, serviceId int, displayName string) (*InstanceStateResponse, error) {
+	debug := func(format string, args ...interface{}) {
+		f, err := os.OpenFile("/tmp/nubes_find_debug.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			return
+		}
+		defer f.Close()
+		fmt.Fprintf(f, format+"\n", args...)
+	}
 	var found []InstanceStateResponse
 
 	// Быстрый поиск через search API
@@ -583,7 +591,7 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 	}
 	respBody, _, err := c.doRequest(ctx, "GET", "/instances?"+searchQuery.Encode(), nil)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "[FIND-DEBUG] search doRequest err: %v (serviceId=%d, name=%q)\n", err, serviceId, displayName)
+		debug("[FIND-DEBUG] search doRequest err: %v (serviceId=%d, name=%q)", err, serviceId, displayName)
 	} else {
 		var res struct {
 			Results []struct {
@@ -593,26 +601,26 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 			} `json:"results"`
 		}
 		if err := json.Unmarshal(respBody, &res); err != nil {
-			fmt.Fprintf(os.Stderr, "[FIND-DEBUG] search json.Unmarshal err: %v (serviceId=%d, name=%q)\n", err, serviceId, displayName)
+			debug("[FIND-DEBUG] search json.Unmarshal err: %v (serviceId=%d, name=%q)", err, serviceId, displayName)
 		} else {
-			fmt.Fprintf(os.Stderr, "[FIND-DEBUG] search returned %d results (serviceId=%d, name=%q)\n", len(res.Results), serviceId, displayName)
+			debug("[FIND-DEBUG] search returned %d results (serviceId=%d, name=%q)", len(res.Results), serviceId, displayName)
 			for _, item := range res.Results {
 				matchSvc := item.ServiceId == serviceId
 				matchName := strings.EqualFold(item.DisplayName, displayName)
-				fmt.Fprintf(os.Stderr, "[FIND-DEBUG] search item uid=%s name=%q svcId=%d matchSvc=%v matchName=%v\n",
+				debug("[FIND-DEBUG] search item uid=%s name=%q svcId=%d matchSvc=%v matchName=%v",
 					item.InstanceUid, item.DisplayName, item.ServiceId, matchSvc, matchName)
 				if matchSvc && matchName {
 					state, err := c.GetInstanceStateRaw(ctx, item.InstanceUid)
 					if err != nil {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] GetInstanceStateRaw err for uid=%s: %v\n", item.InstanceUid, err)
+						debug("[FIND-DEBUG] GetInstanceStateRaw err for uid=%s: %v", item.InstanceUid, err)
 						continue
 					}
 					if state == nil {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] GetInstanceStateRaw returned nil for uid=%s\n", item.InstanceUid)
+						debug("[FIND-DEBUG] GetInstanceStateRaw returned nil for uid=%s", item.InstanceUid)
 						continue
 					}
 					if isInstanceDeleted(state) {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] GetInstanceStateRaw returned deleted for uid=%s (status=%q)\n", item.InstanceUid, state.ExplainedStatus)
+						debug("[FIND-DEBUG] GetInstanceStateRaw returned deleted for uid=%s (status=%q)", item.InstanceUid, state.ExplainedStatus)
 						continue
 					}
 					found = append(found, *state)
@@ -623,7 +631,7 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 
 	// Если быстрый поиск не дал результатов — пагинированный fallback
 	if len(found) == 0 {
-		fmt.Fprintf(os.Stderr, "[FIND-DEBUG] search path failed, entering fallback (serviceId=%d, name=%q)\n", serviceId, displayName)
+		debug("[FIND-DEBUG] search path failed, entering fallback (serviceId=%d, name=%q)", serviceId, displayName)
 		page := 1
 		for {
 			reqURL := c.buildURL(fmt.Sprintf("/instances?page=%d&size=100", page))
@@ -638,7 +646,7 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 
 			resp, err := c.HttpClient.Do(req)
 			if err != nil {
-				fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback page=%d HttpClient.Do err: %v\n", page, err)
+				debug("[FIND-DEBUG] fallback page=%d HttpClient.Do err: %v", page, err)
 				return nil, err
 			}
 			if resp.Body != nil {
@@ -646,7 +654,7 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 			}
 
 			if resp.StatusCode != 200 {
-				fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback page=%d HTTP %d\n", page, resp.StatusCode)
+				debug("[FIND-DEBUG] fallback page=%d HTTP %d", page, resp.StatusCode)
 				return nil, fmt.Errorf("HTTP статус %d", resp.StatusCode)
 			}
 
@@ -658,7 +666,7 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 				} `json:"results"`
 			}
 			if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
-				fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback page=%d json.Decode err: %v\n", page, err)
+				debug("[FIND-DEBUG] fallback page=%d json.Decode err: %v", page, err)
 				return nil, err
 			}
 
@@ -666,26 +674,26 @@ func (c *UniversalClient) FindInstanceByDisplayName(ctx context.Context, service
 				break
 			}
 
-			fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback page=%d has %d results\n", page, len(res.Results))
+			debug("[FIND-DEBUG] fallback page=%d has %d results", page, len(res.Results))
 			for _, item := range res.Results {
 				matchSvc := item.ServiceId == serviceId
 				matchName := strings.EqualFold(item.DisplayName, displayName)
 				if matchSvc || matchName {
-					fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback item uid=%s name=%q svcId=%d matchSvc=%v matchName=%v\n",
+					debug("[FIND-DEBUG] fallback item uid=%s name=%q svcId=%d matchSvc=%v matchName=%v",
 						item.InstanceUid, item.DisplayName, item.ServiceId, matchSvc, matchName)
 				}
 				if matchSvc && matchName {
 					state, err := c.GetInstanceStateRaw(ctx, item.InstanceUid)
 					if err != nil {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback GetInstanceStateRaw err for uid=%s: %v\n", item.InstanceUid, err)
+						debug("[FIND-DEBUG] fallback GetInstanceStateRaw err for uid=%s: %v", item.InstanceUid, err)
 						continue
 					}
 					if state == nil {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback GetInstanceStateRaw returned nil for uid=%s\n", item.InstanceUid)
+						debug("[FIND-DEBUG] fallback GetInstanceStateRaw returned nil for uid=%s", item.InstanceUid)
 						continue
 					}
 					if isInstanceDeleted(state) {
-						fmt.Fprintf(os.Stderr, "[FIND-DEBUG] fallback GetInstanceStateRaw returned deleted for uid=%s (status=%q)\n", item.InstanceUid, state.ExplainedStatus)
+						debug("[FIND-DEBUG] fallback GetInstanceStateRaw returned deleted for uid=%s (status=%q)", item.InstanceUid, state.ExplainedStatus)
 						continue
 					}
 					found = append(found, *state)