[refact][metrics] Move some vfs_legacy metrics to metrics directory

src/client/vfs_legacy/filesystem/dir_cache.cpp

@@ -33,6 +33,7 @@ namespace dingofs {
 namespace client {
 namespace filesystem {
 
+using metrics::client::vfs_legacy::DirCacheMetric;
 using utils::ReadLockGuard;
 using utils::RWLock;
 using utils::TimeSpec;

src/client/vfs_legacy/filesystem/dir_cache.h

@@ -28,7 +28,7 @@
 
 #include "absl/container/btree_map.h"
 #include "client/vfs_legacy/filesystem/meta.h"
-#include "client/vfs_legacy/filesystem/metric.h"
+#include "metrics/client/vfs_legacy/dir_cache.h"
 #include "options/client/vfs_legacy/vfs_legacy_option.h"
 #include "utils/concurrent/concurrent.h"
 #include "utils/lru_cache.h"
@@ -98,7 +98,7 @@ class DirCache {
   DirCacheOption option_;
   std::shared_ptr<LRUType> lru_;
   std::shared_ptr<MessageQueueType> mq_;
-  std::shared_ptr<DirCacheMetric> metric_;
+  std::shared_ptr<metrics::client::vfs_legacy::DirCacheMetric> metric_;
 };
 
 }  // namespace filesystem

src/client/vfs_legacy/filesystem/openfile.cpp

@@ -32,6 +32,7 @@ namespace dingofs {
 namespace client {
 namespace filesystem {
 
+using metrics::client::vfs_legacy::OpenfilesMetric;
 using utils::ReadLockGuard;
 using utils::WriteLockGuard;
 

src/client/vfs_legacy/filesystem/openfile.h

@@ -28,8 +28,8 @@
 
 #include "client/vfs_legacy/filesystem/defer_sync.h"
 #include "client/vfs_legacy/filesystem/meta.h"
-#include "client/vfs_legacy/filesystem/metric.h"
 #include "client/vfs_legacy/inode_wrapper.h"
+#include "metrics/client/vfs_legacy/open_files.h"
 #include "options/client/vfs_legacy/vfs_legacy_option.h"
 
 namespace dingofs {
@@ -66,7 +66,7 @@ class OpenFiles {
   OpenFilesOption option_;
   std::shared_ptr<DeferSync> deferSync_;
   std::unordered_map<Ino, std::unique_ptr<OpenFile>> files_;
-  std::shared_ptr<OpenfilesMetric> metric_;
+  std::shared_ptr<metrics::client::vfs_legacy::OpenfilesMetric> metric_;
 };
 
 }  // namespace filesystem

src/metrics/client/vfs_legacy/dir_cache.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025 dingodb.com, Inc. All Rights Reserved
+ *
+ * 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.
+ */
+
+#ifndef DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_DIR_CACHE_H_
+#define DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_DIR_CACHE_H_
+
+#include <bvar/bvar.h>
+
+namespace dingofs {
+namespace metrics {
+namespace client {
+namespace vfs_legacy {
+
+class DirCacheMetric {
+ public:
+  DirCacheMetric() = default;
+
+  void AddEntries(int64_t n) { metric_.nentries << n; }
+
+ private:
+  struct Metric {
+    Metric() : nentries("filesystem_dircache", "nentries") {}
+    bvar::Adder<int64_t> nentries;
+  };
+
+  Metric metric_;
+};
+
+}  // namespace vfs_legacy
+}  // namespace client
+}  // namespace metrics
+}  // namespace dingofs
+
+#endif  // DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_DIR_CACHE_H_

src/metrics/client/vfs_legacy/open_files.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025 dingodb.com, Inc. All Rights Reserved
+ *
+ * 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.
+ */
+
+#ifndef DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_OPEN_FILES_H_
+#define DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_OPEN_FILES_H_
+
+#include <bvar/bvar.h>
+
+namespace dingofs {
+namespace metrics {
+namespace client {
+namespace vfs_legacy {
+
+class OpenfilesMetric {
+ public:
+  OpenfilesMetric() = default;
+
+  void AddOpenfiles(int64_t n) { metric_.nfiles << n; }
+
+ private:
+  struct Metric {
+    Metric() : nfiles("filesystem_openfiles", "nfiles") {}
+    bvar::Adder<int64_t> nfiles;
+  };
+
+  Metric metric_;
+};
+
+}  // namespace vfs_legacy
+}  // namespace client
+}  // namespace metrics
+}  // namespace dingofs
+
+#endif  // DINGOFS_SRC_METRICS_CLIENT_VFS_LEGACY_OPEN_FILES_H_