From e9d4f5f7a0a3f5a51ad660e0362d6a16dbcae056 Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Tue, 10 Dec 2024 16:08:01 +0800
Subject: [PATCH] metrics: add handler performance metrics (#22581)

---
 metrics/histogram.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/metrics/histogram.go b/metrics/histogram.go
index 46f3bbd2f138b..2c54ce8b4063e 100644
--- a/metrics/histogram.go
+++ b/metrics/histogram.go
@@ -26,6 +26,15 @@ func GetOrRegisterHistogram(name string, r Registry, s Sample) Histogram {
 	return r.GetOrRegister(name, func() Histogram { return NewHistogram(s) }).(Histogram)
 }
 
+// GetOrRegisterHistogramLazy returns an existing Histogram or constructs and
+// registers a new StandardHistogram.
+func GetOrRegisterHistogramLazy(name string, r Registry, s func() Sample) Histogram {
+	if nil == r {
+		r = DefaultRegistry
+	}
+	return r.GetOrRegister(name, func() Histogram { return NewHistogram(s()) }).(Histogram)
+}
+
 // NewHistogram constructs a new StandardHistogram from a Sample.
 func NewHistogram(s Sample) Histogram {
 	if !Enabled {