From 4066ad4cc58b5d75c0399c7cde50f294eae51504 Mon Sep 17 00:00:00 2001
From: Dan Cline <6798349+Rjected@users.noreply.github.com>
Date: Thu, 6 Feb 2025 17:35:03 -0500
Subject: [PATCH] feat: add newPayload latency gauge metric (#14287)

---
 crates/rpc/rpc-engine-api/src/metrics.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/rpc/rpc-engine-api/src/metrics.rs b/crates/rpc/rpc-engine-api/src/metrics.rs
index 9325ce267..6a7cf7ce3 100644
--- a/crates/rpc/rpc-engine-api/src/metrics.rs
+++ b/crates/rpc/rpc-engine-api/src/metrics.rs
@@ -2,7 +2,7 @@ use std::time::Duration;
 
 use crate::EngineApiError;
 use alloy_rpc_types_engine::{ForkchoiceUpdated, PayloadStatus, PayloadStatusEnum};
-use metrics::{Counter, Histogram};
+use metrics::{Counter, Gauge, Histogram};
 use reth_metrics::Metrics;
 
 /// All beacon consensus engine metrics
@@ -100,6 +100,8 @@ pub(crate) struct NewPayloadStatusResponseMetrics {
     pub(crate) new_payload_total_gas: Histogram,
     /// The gas per second of valid new payload messages received.
     pub(crate) new_payload_gas_per_second: Histogram,
+    /// Latency for the last `engine_newPayloadV*` call
+    pub(crate) new_payload_last: Gauge,
 }
 
 impl NewPayloadStatusResponseMetrics {
@@ -110,6 +112,7 @@ impl NewPayloadStatusResponseMetrics {
         gas_used: u64,
         time: Duration,
     ) {
+        self.new_payload_last.set(time);
         match result {
             Ok(status) => match status.status {
                 PayloadStatusEnum::Valid => {