[sig-migrate] Added multithreading support

internal/tools/sigmigrate/README.md

@@ -100,19 +100,19 @@ d8 tools sig-migrate \
 5. **Error Handling**:
    - If a resource does not support annotations (MethodNotAllowed), it is added to the list of unsupported types and skipped in the future.
    - If the operation is forbidden for the current service account, the command automatically attempts to use an alternative service account (`system:serviceaccount:d8-multitenancy-manager:multitenancy-manager`).
-   - Each run writes failed/skipped artifacts to run-scoped files in `/tmp` with a timestamp suffix (for example: `/tmp/failed_annotations_20260414T151625Z.txt`, `/tmp/failed_errors_20260414T151625Z.txt`, `/tmp/skipped_objects_20260414T151625Z.txt`).
-   - For backward-compatible retry UX, the latest failed annotations are also synced to legacy `/tmp/failed_annotations.txt`, so `--retry` continues to work without extra arguments.
+   - Each run writes failed/skipped artifacts to run-scoped files in `/tmp` with a timestamp suffix (for example: `/tmp/failed_annotations_20260414T151625Z.log`, `/tmp/failed_errors_20260414T151625Z.log`, `/tmp/skipped_objects_20260414T151625Z.log`).
+   - For backward-compatible retry UX, the latest failed annotations are also synced to legacy `/tmp/failed_annotations.log`, so `--retry` continues to work without extra arguments.
    - A dedicated trace debug log is written to `/tmp/sigmigrate_trace_<timestamp>.log` with detailed execution/error diagnostics.
 
 ## Retry Files
 
 The command creates run-scoped files to track failed operations:
 
-- `/tmp/failed_annotations_<timestamp>.txt` - list of objects in `namespace|name|kind|group|version` format that failed to be processed
-- `/tmp/failed_errors_<timestamp>.txt` - detailed error information in `namespace|name|kind|error_message` format
-- `/tmp/skipped_objects_<timestamp>.txt` - skipped objects with reason/details
+- `/tmp/failed_annotations_<timestamp>.log` - list of objects in `namespace|name|kind|group|version` format that failed to be processed
+- `/tmp/failed_errors_<timestamp>.log` - detailed error information in `namespace|name|kind|error_message` format
+- `/tmp/skipped_objects_<timestamp>.log` - skipped objects with reason/details
 
-For retry compatibility, failed annotations are also mirrored into legacy `/tmp/failed_annotations.txt` and `--retry` reads from that legacy file (supports both old `namespace|name|kind` and new `namespace|name|kind|group|version` lines).
+For retry compatibility, failed annotations are also mirrored into legacy `/tmp/failed_annotations.log` and `--retry` reads from that legacy file (supports both old `namespace|name|kind` and new `namespace|name|kind|group|version` lines).
 
 ### Automatic Failure Detection
 
@@ -128,8 +128,8 @@ Example output when failures occur:
 ⚠️  Migration completed with 5 failed object(s).
 
 Some objects could not be annotated. Please check the error details:
-  Error log file: /tmp/failed_errors_<timestamp>.txt
-  Failed objects list: /tmp/failed_annotations_<timestamp>.txt
+  Error log file: /tmp/failed_errors_<timestamp>.log
+  Failed objects list: /tmp/failed_annotations_<timestamp>.log
   Trace log file: /tmp/sigmigrate_trace_<timestamp>.log
 
 To investigate the issues:

internal/tools/sigmigrate/cmd/flags.go

@@ -20,6 +20,12 @@ import (
 	"os"
 
 	"github.com/spf13/pflag"
+
+	"github.com/deckhouse/deckhouse-cli/internal/tools/sigmigrate"
+)
+
+const (
+	defaultKubectlAs = "system:serviceaccount:d8-system:deckhouse"
 )
 
 func addFlags(flags *pflag.FlagSet) {
@@ -31,7 +37,7 @@ func addFlags(flags *pflag.FlagSet) {
 
 	flags.String(
 		"as",
-		"system:serviceaccount:d8-system:deckhouse",
+		defaultKubectlAs,
 		"Specify a Kubernetes service account for the kubectl operations (impersonation).",
 	)
 
@@ -63,4 +69,16 @@ func addFlags(flags *pflag.FlagSet) {
 		"",
 		"Process objects by identifier in format <namespace>/<name>/<resource_name>. Use 'clusterwide' namespace for cluster-scoped resources. Resource name must match kubectl api-resources output.",
 	)
+
+	flags.Int(
+		"threads",
+		sigmigrate.DefaultWorkerCount,
+		"Number of worker threads for resource discovery and migration. Values <=0 use default.",
+	)
+
+	flags.Bool(
+		"measure-stages",
+		false,
+		"Print execution time for major migration stages.",
+	)
 }

internal/tools/sigmigrate/cmd/flags_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2025 Flant JSC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"testing"
+
+	"github.com/deckhouse/deckhouse-cli/internal/tools/sigmigrate"
+	"github.com/spf13/pflag"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAddFlags_DefaultThreadsMatchesCoreConstant(t *testing.T) {
+	flags := pflag.NewFlagSet("sig-migrate", pflag.ContinueOnError)
+	addFlags(flags)
+
+	threads, err := flags.GetInt("threads")
+	require.NoError(t, err)
+	require.Equal(t, sigmigrate.DefaultWorkerCount, threads)
+}
+
+func TestAddFlags_DefaultLogLevel(t *testing.T) {
+	flags := pflag.NewFlagSet("sig-migrate", pflag.ContinueOnError)
+	addFlags(flags)
+
+	logLevel, err := flags.GetString("log-level")
+	require.NoError(t, err)
+	require.Equal(t, "DEBUG", logLevel)
+}