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

crates/obs/src/metrics/schema/node_bucket.rs

@@ -0,0 +1,50 @@
+// 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.
+
+#![allow(dead_code)]
+
+use crate::{MetricDescriptor, MetricName, new_gauge_md, subsystems};
+use std::sync::LazyLock;
+
+const BUCKET_LABEL: &str = "bucket";
+
+/// Total bytes used by the bucket
+pub static BUCKET_USAGE_BYTES_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("usage_bytes".to_string()),
+        "Total bytes used by the bucket",
+        &[BUCKET_LABEL],
+        subsystems::BUCKET_API,
+    )
+});
+
+/// Total number of objects in the bucket
+pub static BUCKET_OBJECTS_TOTAL_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("objects_total".to_string()),
+        "Total number of objects in the bucket",
+        &[BUCKET_LABEL],
+        subsystems::BUCKET_API,
+    )
+});
+
+/// Quota limit in bytes for the bucket
+pub static BUCKET_QUOTA_BYTES_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("quota_bytes".to_string()),
+        "Quota limit in bytes for the bucket",
+        &[BUCKET_LABEL],
+        subsystems::BUCKET_API,
+    )
+});