s3-gw: drop build time setting

It's not properly set anyway and it's a bad practice for build
reproducibility.

Signed-off-by: Roman Khimov <roman@nspcc.ru>

api/metrics/collector.go

@@ -19,8 +19,6 @@ var (
 		[]string{
 			// current version
 			"version",
-			// build time of the current version
-			"build_time",
 		},
 	)
 
@@ -62,7 +60,7 @@ func (s *stats) Describe(ch chan<- *prometheus.Desc) {
 
 func (s *stats) Collect(ch chan<- prometheus.Metric) {
 	// Expose current version information
-	versionInfo.WithLabelValues(misc.Version, misc.Build).Set(1.0)
+	versionInfo.WithLabelValues(misc.Version).Set(1.0)
 
 	// connect collectors
 	collectHTTPMetrics(ch)

cmd/s3-gw/app-settings.go

@@ -181,7 +181,6 @@ func newSettings() *viper.Viper {
 	// set prefers:
 	v.Set(cfgApplicationName, misc.ApplicationName)
 	v.Set(cfgApplicationVersion, misc.Version)
-	v.Set(cfgApplicationBuildTime, misc.Build)
 
 	// set defaults:
 
@@ -229,7 +228,7 @@ func newSettings() *viper.Viper {
 
 	switch {
 	case help != nil && *help:
-		fmt.Printf("NeoFS S3 Gateway %s (%s)\n", misc.Version, misc.Build)
+		fmt.Printf("NeoFS S3 Gateway %s\n", misc.Version)
 		flags.PrintDefaults()
 
 		fmt.Println()
@@ -256,7 +255,7 @@ func newSettings() *viper.Viper {
 
 		os.Exit(0)
 	case version != nil && *version:
-		fmt.Printf("NeoFS S3 Gateway %s (%s)\n", misc.Version, misc.Build)
+		fmt.Printf("NeoFS S3 Gateway %s\n", misc.Version)
 		os.Exit(0)
 	case ttl != nil && ttl.Minutes() < minimumTTLInMinutes:
 		fmt.Printf("connection ttl should not be less than %s", defaultTTL)

misc/build.go

@@ -9,8 +9,6 @@ const (
 )
 
 var (
-	// Build holds build timestamp.
-	Build = "now"
 	// Version contains application version.
 	Version = "dev"
 )