From e92c987dc3c1dbdc5c6ed3a5335bcd8a87d50a5f Mon Sep 17 00:00:00 2001
From: Roman Khavronenko <hagen1778@gmail.com>
Date: Tue, 21 Dec 2021 20:25:47 +0200
Subject: [PATCH] vmalert: check if remoteWrite is configured for replay mode
 (#1990)

* vmalert: check if remoteWrite is configured for replay mode

The purpose of `replay` mode is to backfill results of recording
or alerting rules. So `remoteWrite.url` should be required.
Otherwise, process can fail on attempt to send data.

Signed-off-by: hagen1778 <roman@victoriametrics.com>

* Update app/vmalert/main.go

Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
---
 app/vmalert/main.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/vmalert/main.go b/app/vmalert/main.go
index 540ff27ff..5fdeb811d 100644
--- a/app/vmalert/main.go
+++ b/app/vmalert/main.go
@@ -97,6 +97,9 @@ func main() {
 		if err != nil {
 			logger.Fatalf("failed to init remoteWrite: %s", err)
 		}
+		if rw == nil {
+			logger.Fatalf("remoteWrite.url can't be empty in replay mode")
+		}
 		notifier.InitTemplateFunc(eu)
 		groupsCfg, err := config.Parse(*rulePath, *validateTemplates, *validateExpressions)
 		if err != nil {