refactor(metrics): unify process sampling and split network IO (#2590)

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

@@ -0,0 +1,38 @@
+// 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;
+
+/// Host network I/O bytes collected from system network interfaces.
+pub static HOST_NETWORK_IO_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::HostNetworkIO,
+        "Network bytes transferred across system network interfaces",
+        &[],
+        subsystems::SYSTEM_NETWORK_HOST,
+    )
+});
+
+/// Host network I/O bytes collected from system network interfaces, grouped per interface.
+pub static HOST_NETWORK_IO_PER_INTERFACE_MD: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::HostNetworkIOPerInterface,
+        "Network bytes transferred across system network interfaces (per interface)",
+        &[],
+        subsystems::SYSTEM_NETWORK_HOST,
+    )
+});