From 67511d4165611adf06e90f768e9ef81febb029e8 Mon Sep 17 00:00:00 2001
From: DexterZhang <1105367836@qq.com>
Date: Thu, 30 Apr 2020 07:00:32 +0800
Subject: [PATCH] feat(vmagent): add promscrap config reload suppport via http
 (#450)

* feat(vmagent): add promscrap config reload suppport via http endpoint `/-/reload`

* fix: typo fix
---
 app/vmagent/main.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/app/vmagent/main.go b/app/vmagent/main.go
index b7fc4630e9..7b8501031f 100644
--- a/app/vmagent/main.go
+++ b/app/vmagent/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/csvimport"
@@ -157,6 +158,15 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		w.Header().Set("Content-Type", "text/plain")
 		promscrape.WriteHumanReadableTargetsStatus(w)
 		return true
+	case "/-/reload":
+		promscrapeConfigReloadRequests.Inc()
+		if err := syscall.Kill(syscall.Getpid(), syscall.SIGHUP); err != nil {
+			promscrapeConfigReloadErrors.Inc()
+			httpserver.Errorf(w, "Fail to reload config file, %s", err)
+			return true
+		}
+		w.WriteHeader(http.StatusNoContent)
+		return true
 	}
 	return false
 }
@@ -177,4 +187,7 @@ var (
 	influxQueryRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/query", protocol="influx"}`)
 
 	promscrapeTargetsRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/targets"}`)
+
+	promscrapeConfigReloadRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/-/reload"}`)
+	promscrapeConfigReloadErrors   = metrics.NewCounter(`vmagent_http_request_errors_total{path="/-/reload"}`)
 )