From 5c41ca84e5056d3cab46911c13f3e91128a612a9 Mon Sep 17 00:00:00 2001
From: beorn7 <beorn@soundcloud.com>
Date: Tue, 1 Nov 2016 15:17:59 +0100
Subject: [PATCH] Catch negative staleness delta set on the command line

---
 cmd/prometheus/config.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/prometheus/config.go b/cmd/prometheus/config.go
index 9e0f2eca1..879210827 100644
--- a/cmd/prometheus/config.go
+++ b/cmd/prometheus/config.go
@@ -262,6 +262,10 @@ func parse(args []string) error {
 		return err
 	}
 
+	if promql.StalenessDelta < 0 {
+		return fmt.Errorf("negative staleness delta: %s", promql.StalenessDelta)
+	}
+
 	if err := parsePrometheusURL(); err != nil {
 		return err
 	}