refactor(obs): migrate metrics runtime/schema and tighten migration guards (#2584)

crates/io-metrics/src/sampler/mod.rs

@@ -0,0 +1,22 @@
+// Copyright 2024 RustFS Team
+//
+// 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.
+
+pub mod process;
+pub mod system;
+
+pub use process::{
+    ProcessResourceSnapshot, ProcessStatusSnapshot, ProcessSystemSnapshot, snapshot_process_resource,
+    snapshot_process_resource_and_system, snapshot_process_system,
+};
+pub use system::snapshot_process_platform;