Merge pull request 'Implemented system metrics' (#472) from jpds/garage:system-metrics into main

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/472
Reviewed-by: Alex <alex@adnab.me>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/rpc/system_metrics.rs b/src/rpc/system_metrics.rs
new file mode 100644
index 00000000..d96b67e4
--- /dev/null
+++ b/src/rpc/system_metrics.rs
@@ -0,0 +1,33 @@
+use opentelemetry::{global, metrics::*, KeyValue};
+
+/// TableMetrics reference all counter used for metrics
+pub struct SystemMetrics {
+	pub(crate) _garage_build_info: ValueObserver<u64>,
+	pub(crate) _replication_factor: ValueObserver<u64>,
+}
+
+impl SystemMetrics {
+	pub fn new(replication_factor: usize) -> Self {
+		let meter = global::meter("garage_system");
+		Self {
+			_garage_build_info: meter
+				.u64_value_observer("garage_build_info", move |observer| {
+					observer.observe(
+						1,
+						&[KeyValue::new(
+							"version",
+							garage_util::version::garage_version(),
+						)],
+					)
+				})
+				.with_description("Garage build info")
+				.init(),
+			_replication_factor: meter
+				.u64_value_observer("garage_replication_factor", move |observer| {
+					observer.observe(replication_factor as u64, &[])
+				})
+				.with_description("Garage replication factor setting")
+				.init(),
+		}
+	}
+}