[#1355] adm: Run metabase upgrade concurrently

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-adm/internal/modules/metabase/upgrade.go

@@ -3,6 +3,7 @@ package metabase
 import (
 	"errors"
 	"fmt"
+	"sync"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-adm/internal/commonflags"
@@ -11,6 +12,7 @@ import (
 	shardconfig "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config/engine/shard"
 	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
 	"github.com/spf13/cobra"
+	"golang.org/x/sync/errgroup"
 )
 
 const (
@@ -57,17 +59,28 @@ func upgrade(cmd *cobra.Command, _ []string) error {
 		cmd.Println(i+1, ":", path)
 	}
 	result := make(map[string]bool)
+	var resultGuard sync.Mutex
+	eg, ctx := errgroup.WithContext(cmd.Context())
 	for _, path := range paths {
+		eg.Go(func() error {
+			var success bool
 			cmd.Println("upgrading metabase", path, "...")
-		if err := meta.Upgrade(cmd.Context(), path, !noCompact, func(a ...any) {
+			if err := meta.Upgrade(ctx, path, !noCompact, func(a ...any) {
 				cmd.Println(append([]any{time.Now().Format(time.RFC3339), ":", path, ":"}, a...)...)
 			}); err != nil {
-			result[path] = false
 				cmd.Println("error: failed to upgrade metabase", path, ":", err)
 			} else {
-			result[path] = true
+				success = true
 				cmd.Println("metabase", path, "upgraded successfully")
 			}
+			resultGuard.Lock()
+			result[path] = success
+			resultGuard.Unlock()
+			return nil
+		})
+	}
+	if err := eg.Wait(); err != nil {
+		return err
 	}
 	for mb, ok := range result {
 		if ok {