Print to stdout, not stderr (#928)

Following the change in
https://github.com/prometheus/prometheus/pull/8542 blackbox_exporter
will send all usage out to stdout, not stderr.

Fixes: #912
Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>

diff --git a/main.go b/main.go
index 849659e7b605dbb65ab011e12be2e621aef49bd6..bdc73ae066304f4a5bf5db63f1e9805f3ad37614 100644 (file)
--- a/main.go
+++ b/main.go
@@ -244,6 +244,7 @@ func main() {
 }
 
 func run() int {
+       kingpin.CommandLine.UsageWriter(os.Stdout)
        promlogConfig := &promlog.Config{}
        flag.AddFlags(kingpin.CommandLine, promlogConfig)
        kingpin.Version(version.Print("blackbox_exporter"))