feat(compression): show cluster-level compression stat in grafana (#4112)

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

@@ -0,0 +1,61 @@
+// 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.
+
+use crate::{MetricDescriptor, MetricName, new_counter_md, new_gauge_md, subsystems};
+use std::sync::LazyLock;
+
+pub static COMPRESSION_BYTES_ORIGINAL_TOTAL: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_counter_md(
+        MetricName::OriginedBytesTotal,
+        "Total bytes before compression (original)",
+        &["compression"],
+        subsystems::COMPRESSION,
+    )
+});
+
+pub static COMPRESSION_BYTES_COMPRESSED_TOTAL: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_counter_md(
+        MetricName::CompressedBytesTotal,
+        "Total bytes after compression",
+        &["compression"],
+        subsystems::COMPRESSION,
+    )
+});
+
+pub static COMPRESSION_BYTES_SAVED_TOTAL: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_counter_md(
+        MetricName::SavedBytesTotal,
+        "Total bytes saved by compression",
+        &["compression"],
+        subsystems::COMPRESSION,
+    )
+});
+
+pub static COMPRESSION_RATIO: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_gauge_md(
+        MetricName::CompressionRatio,
+        "Compression ratio (0.0 - 1.0)",
+        &["compression"],
+        subsystems::COMPRESSION,
+    )
+});
+
+pub static COMPRESSION_OPERATIONS_TOTAL: LazyLock<MetricDescriptor> = LazyLock::new(|| {
+    new_counter_md(
+        MetricName::CompressionOperationsTotal,
+        "Total number of compression operations performed",
+        &["compression"],
+        subsystems::COMPRESSION,
+    )
+});