From a71a210704d16e110406ef4d1176c59808ef4d8e Mon Sep 17 00:00:00 2001
From: Kevin Wan <wanjunfeng@gmail.com>
Date: Sun, 31 Oct 2021 18:54:13 +0800
Subject: [PATCH] feat: let different services start prometheus on demand
 (#1182)

---
 core/prometheus/agent.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/core/prometheus/agent.go b/core/prometheus/agent.go
index 64f04bd8..1a294c88 100644
--- a/core/prometheus/agent.go
+++ b/core/prometheus/agent.go
@@ -23,11 +23,11 @@ func Enabled() bool {
 
 // StartAgent starts a prometheus agent.
 func StartAgent(c Config) {
-	once.Do(func() {
-		if len(c.Host) == 0 {
-			return
-		}
+	if len(c.Host) == 0 {
+		return
+	}
 
+	once.Do(func() {
 		enabled.Set(true)
 		threading.GoSafe(func() {
 			http.Handle(c.Path, promhttp.Handler())