feat: expose version information over prometheus (#6195)

crates/node-core/src/lib.rs

@@ -14,11 +14,14 @@ pub mod dirs;
 pub mod engine_api_store;
 pub mod events;
 pub mod init;
+pub mod metrics;
 pub mod node_config;
-pub mod prometheus_exporter;
 pub mod utils;
 pub mod version;
 
+// Re-export for backwards compatibility.
+pub use metrics::prometheus_exporter;
+
 /// Re-exported from `reth_primitives`.
 pub mod primitives {
     pub use reth_primitives::*;

crates/node-core/src/metrics/mod.rs

@@ -0,0 +1,4 @@
+//! Metrics utilities for the node.
+
+pub mod prometheus_exporter;
+pub mod version_metrics;

crates/node-core/src/metrics/prometheus_exporter.rs

@@ -1,5 +1,6 @@
 //! Prometheus exporter
 
+use crate::metrics::version_metrics::register_version_metrics;
 use eyre::WrapErr;
 use hyper::{
     service::{make_service_fn, service_fn},
@@ -104,6 +105,7 @@ where
     process.describe();
     describe_memory_stats();
     describe_io_stats();
+    register_version_metrics();
 
     Ok(())
 }

crates/node-core/src/metrics/version_metrics.rs

@@ -0,0 +1,18 @@
+//! This exposes reth's version information over prometheus.
+
+use crate::version::build_profile_name;
+use metrics::register_gauge;
+
+const LABELS: [(&str, &str); 6] = [
+    ("version", env!("CARGO_PKG_VERSION")),
+    ("build_timestamp", env!("VERGEN_BUILD_TIMESTAMP")),
+    ("cargo_features", env!("VERGEN_CARGO_FEATURES")),
+    ("git_sha", env!("VERGEN_GIT_SHA")),
+    ("target_triple", env!("VERGEN_CARGO_TARGET_TRIPLE")),
+    ("build_profile", build_profile_name()),
+];
+
+/// This exposes reth's version information over prometheus.
+pub fn register_version_metrics() {
+    register_gauge!("info", &LABELS);
+}

crates/node-core/src/node_config.rs

@@ -16,7 +16,7 @@ use crate::{
     engine_api_store::EngineApiStore,
     events,
     init::init_genesis,
-    prometheus_exporter,
+    metrics::prometheus_exporter,
     utils::{get_single_header, write_peers_to_file},
     version::SHORT_VERSION,
 };

crates/node-core/src/version.rs

@@ -79,7 +79,7 @@ pub fn default_extradata() -> String {
     format!("reth/v{}/{}", env!("CARGO_PKG_VERSION"), std::env::consts::OS)
 }
 
-const fn build_profile_name() -> &'static str {
+pub(crate) const fn build_profile_name() -> &'static str {
     // Derived from https://stackoverflow.com/questions/73595435/how-to-get-profile-from-cargo-toml-in-build-rs-or-at-runtime
     // We split on the path separator of the *host* machine, which may be different from
     // `std::path::MAIN_SEPARATOR_STR`.