From 7fe60017cfdf5d7634b415f37d39b5d85362ddf6 Mon Sep 17 00:00:00 2001
From: Dan Cline <6798349+Rjected@users.noreply.github.com>
Date: Mon, 26 Jan 2026 17:54:20 +0000
Subject: [PATCH] chore(metrics): add a gas_last metric similar to
 new_payload_last (#21437)

---
 crates/engine/tree/src/tree/metrics.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/engine/tree/src/tree/metrics.rs b/crates/engine/tree/src/tree/metrics.rs
index 943661a5c5..5a97eae36d 100644
--- a/crates/engine/tree/src/tree/metrics.rs
+++ b/crates/engine/tree/src/tree/metrics.rs
@@ -242,6 +242,8 @@ pub(crate) struct NewPayloadStatusMetrics {
     pub(crate) new_payload_error: Counter,
     /// The total gas of valid new payload messages received.
     pub(crate) new_payload_total_gas: Histogram,
+    /// The gas used for the last valid new payload.
+    pub(crate) new_payload_total_gas_last: Gauge,
     /// The gas per second of valid new payload messages received.
     pub(crate) new_payload_gas_per_second: Histogram,
     /// The gas per second for the last new payload call.
@@ -283,6 +285,7 @@ impl NewPayloadStatusMetrics {
                 PayloadStatusEnum::Valid => {
                     self.new_payload_valid.increment(1);
                     self.new_payload_total_gas.record(gas_used as f64);
+                    self.new_payload_total_gas_last.set(gas_used as f64);
                     let gas_per_second = gas_used as f64 / elapsed.as_secs_f64();
                     self.new_payload_gas_per_second.record(gas_per_second);
                     self.new_payload_gas_per_second_last.set(gas_per_second);