feat(metrics): add rust-peer version info in prometheus metrics [fixes …

…NET-422] (#1552)

* add rust-peer version info in prometheus metrics

crates/peer-metrics/src/info.rs

@@ -0,0 +1,17 @@
+use prometheus_client::metrics::info::Info;
+use prometheus_client::registry::Registry;
+
+pub fn add_info_metrics(
+    registry: &mut Registry,
+    node_version: String,
+    air_version: String,
+    spell_version: String,
+) {
+    let sub_registry = registry.sub_registry_with_prefix("rust_peer");
+    let info = Info::new(vec![
+        ("peer-version", node_version),
+        ("air-version", air_version),
+        ("spell-version", spell_version),
+    ]);
+    sub_registry.register("build", "Rust Peer Info", info);
+}

crates/peer-metrics/src/lib.rs

@@ -7,6 +7,7 @@ pub use connection_pool::ConnectionPoolMetrics;
 pub use connectivity::ConnectivityMetrics;
 pub use connectivity::Resolution;
 pub use dispatcher::DispatcherMetrics;
+pub use info::add_info_metrics;
 pub use particle_executor::{FunctionKind, ParticleExecutorMetrics};
 pub use services_metrics::{
     ServiceCallStats, ServiceMemoryStat, ServiceType, ServicesMetrics, ServicesMetricsBackend,
@@ -17,6 +18,7 @@ pub use vm_pool::VmPoolMetrics;
 mod connection_pool;
 mod connectivity;
 mod dispatcher;
+mod info;
 mod network_protocol;
 mod particle_executor;
 mod services_metrics;

particle-node/src/node.rs

@@ -266,6 +266,14 @@ impl<RT: AquaRuntime> Node<RT> {
             spell_version,
             allowed_binaries,
         };
+        if let Some(m) = metrics_registry.as_mut() {
+            peer_metrics::add_info_metrics(
+                m,
+                node_info.node_version.to_string(),
+                node_info.air_version.to_string(),
+                node_info.spell_version.clone(),
+            );
+        }
         custom_service_functions.extend_one(make_peer_builtin(node_info));
 
         custom_service_functions.into_iter().for_each(