From fb338c50a3738b90838b63a30dd5ff72795fdbc2 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Fri, 25 Dec 2020 16:40:20 +0200
Subject: [PATCH] app/victoria-metrics: show usage info when incorrect
 command-line flag is passed to executable

---
 app/victoria-metrics/main.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/app/victoria-metrics/main.go b/app/victoria-metrics/main.go
index 517c10aea7..61f3e61c8d 100644
--- a/app/victoria-metrics/main.go
+++ b/app/victoria-metrics/main.go
@@ -15,6 +15,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
@@ -35,6 +36,7 @@ var (
 func main() {
 	// Write flags and help message to stdout, since it is easier to grep or pipe.
 	flag.CommandLine.SetOutput(os.Stdout)
+	flag.Usage = usage
 	envflag.Parse()
 	buildinfo.Init()
 	logger.Init()
@@ -115,3 +117,12 @@ func writeAPIHelp(w io.Writer, pathList [][]string) {
 		fmt.Fprintf(w, "<a href='%s'>%q</a> - %s<br/>", p, p, doc)
 	}
 }
+
+func usage() {
+	const s = `
+victoria-metrics is a time series database and monitoring solution.
+
+See the docs at https://victoriametrics.github.io/
+`
+	flagutil.Usage(s)
+}