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

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

@@ -0,0 +1,48 @@
+// 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, MetricSubsystem, new_gauge_md};
+use std::sync::LazyLock;
+
+/// CPU usage of the RustFS process as a percentage
+pub static PROCESS_CPU_PERCENT_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("cpu_percent".to_string()),
+        "CPU usage of the RustFS process as a percentage",
+        &[],
+        MetricSubsystem::new("/process"),
+    )
+});
+
+/// Resident memory usage of the RustFS process in bytes
+pub static PROCESS_MEMORY_BYTES_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("memory_bytes".to_string()),
+        "Resident memory usage of the RustFS process in bytes",
+        &[],
+        MetricSubsystem::new("/process"),
+    )
+});
+
+/// Uptime of the RustFS process in seconds
+pub static PROCESS_UPTIME_SECONDS_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::Custom("uptime_seconds".to_string()),
+        "Uptime of the RustFS process in seconds",
+        &[],
+        MetricSubsystem::new("/process"),
+    )
+});