From 6af8c187e0b7d441553588ae79c80d54d1fcc8d7 Mon Sep 17 00:00:00 2001
From: ethDreamer <37123614+ethDreamer@users.noreply.github.com>
Date: Wed, 21 May 2025 21:51:30 -0500
Subject: [PATCH] Publish EL Info in Metrics (#7052)

Since we now know the EL version, we should publish this to our metrics periodically.
---
 .../execution_layer/src/engine_api/http.rs    |  4 +++
 beacon_node/execution_layer/src/lib.rs        |  8 ++++--
 beacon_node/execution_layer/src/metrics.rs    | 26 +++++++++++++++++++
 3 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/beacon_node/execution_layer/src/engine_api/http.rs b/beacon_node/execution_layer/src/engine_api/http.rs
index bf4c391a8d..c79036ba61 100644
--- a/beacon_node/execution_layer/src/engine_api/http.rs
+++ b/beacon_node/execution_layer/src/engine_api/http.rs
@@ -1242,6 +1242,10 @@ impl HttpJsonRpc {
         } else {
             let engine_version = self.get_client_version_v1().await?;
             *lock = Some(CachedResponse::new(engine_version.clone()));
+            if !engine_version.is_empty() {
+                // reset metric gauge when there's a fresh fetch
+                crate::metrics::reset_execution_layer_info_gauge();
+            }
             Ok(engine_version)
         }
     }
diff --git a/beacon_node/execution_layer/src/lib.rs b/beacon_node/execution_layer/src/lib.rs
index 248bca6826..4761c47d41 100644
--- a/beacon_node/execution_layer/src/lib.rs
+++ b/beacon_node/execution_layer/src/lib.rs
@@ -1554,10 +1554,14 @@ impl<E: EthSpec> ExecutionLayer<E> {
         &self,
         age_limit: Option<Duration>,
     ) -> Result<Vec<ClientVersionV1>, Error> {
-        self.engine()
+        let versions = self
+            .engine()
             .request(|engine| engine.get_engine_version(age_limit))
             .await
-            .map_err(Into::into)
+            .map_err(Into::<Error>::into)?;
+        metrics::expose_execution_layer_info(&versions);
+
+        Ok(versions)
     }
 
     /// Used during block production to determine if the merge has been triggered.
diff --git a/beacon_node/execution_layer/src/metrics.rs b/beacon_node/execution_layer/src/metrics.rs
index ab1a22677f..aba8434c8e 100644
--- a/beacon_node/execution_layer/src/metrics.rs
+++ b/beacon_node/execution_layer/src/metrics.rs
@@ -116,3 +116,29 @@ pub static EXECUTION_LAYER_PAYLOAD_BIDS: LazyLock<Result<IntGaugeVec>> = LazyLoc
         &["source"]
     )
 });
+pub static EXECUTION_LAYER_INFO: LazyLock<Result<IntGaugeVec>> = LazyLock::new(|| {
+    try_create_int_gauge_vec(
+        "execution_layer_info",
+        "The build of the execution layer connected to lighthouse",
+        &["code", "name", "version", "commit"],
+    )
+});
+
+pub fn reset_execution_layer_info_gauge() {
+    let _ = EXECUTION_LAYER_INFO.as_ref().map(|gauge| gauge.reset());
+}
+
+pub fn expose_execution_layer_info(els: &Vec<crate::ClientVersionV1>) {
+    for el in els {
+        set_gauge_vec(
+            &EXECUTION_LAYER_INFO,
+            &[
+                &el.code.to_string(),
+                &el.name,
+                &el.version,
+                &el.commit.to_string(),
+            ],
+            1,
+        );
+    }
+}