chore (supervisor): add global metrics

Cargo.toml

@@ -238,6 +238,7 @@ tracing = { version = "0.1.41", default-features = false }
 metrics = { version = "0.24.2", default-features = false }
 prometheus = { version = "0.14.0", default-features = false }
 metrics-exporter-prometheus = { version = "0.17.0", default-features = false }
+metrics-process = "2.4.0"
 
 # Testing
 pprof = "0.15.0"

crates/utilities/cli/Cargo.toml

@@ -18,6 +18,7 @@ clap = { workspace = true, features = ["derive", "env"] }
 tracing-subscriber = { workspace = true, features = ["fmt", "env-filter", "json", "tracing-log"] }
 tracing-appender.workspace = true
 metrics-exporter-prometheus = { workspace = true, features = ["http-listener"] }
+metrics-process.workspace = true
 anyhow = { workspace = true, default-features = false }
 
 # `secrets` feature

crates/utilities/cli/src/prometheus.rs

@@ -1,7 +1,12 @@
 //! Utilities for spinning up a prometheus metrics server.
 
 use metrics_exporter_prometheus::{BuildError, PrometheusBuilder};
-use std::net::{IpAddr, SocketAddr};
+use metrics_process::Collector;
+use std::{
+    net::{IpAddr, SocketAddr},
+    thread::{self, sleep},
+    time::Duration,
+};
 use tracing::info;
 
 /// Start a Prometheus metrics server on the given port.
@@ -10,6 +15,18 @@ pub fn init_prometheus_server(addr: IpAddr, metrics_port: u16) -> Result<(), Bui
     let builder = PrometheusBuilder::new().with_http_listener(prometheus_addr);
 
     builder.install()?;
+
+    // Initialise collector for system metrics e.g. CPU, memory, etc.
+    let collector = Collector::default();
+    collector.describe();
+
+    thread::spawn(move || {
+        loop {
+            collector.collect();
+            sleep(Duration::from_secs(60));
+        }
+    });
+
     info!(
         target: "prometheus",
         "Serving metrics at: http://{}",