Add documentation about checkNewVersion

cmd/traefik/traefik.go

@@ -114,9 +114,7 @@ func runCmd(staticConfiguration *static.Configuration) error {
 		log.Debug().RawJSON("staticConfiguration", []byte(redactedStaticConfiguration)).Msg("Static configuration loaded [json]")
 	}
 
-	if staticConfiguration.Global.CheckNewVersion {
-		checkNewVersion()
-	}
+	checkNewVersion(staticConfiguration)
 
 	stats(staticConfiguration)
 
@@ -614,13 +612,28 @@ func setupTracing(ctx context.Context, conf *static.Tracing) (*tracing.Tracer, i
 	return tracer, closer
 }
 
-func checkNewVersion() {
-	ticker := time.Tick(24 * time.Hour)
-	safe.Go(func() {
-		for time.Sleep(10 * time.Minute); ; <-ticker {
-			version.CheckNewVersion()
-		}
-	})
+func checkNewVersion(staticConfiguration *static.Configuration) {
+	logger := log.With().Logger()
+
+	if staticConfiguration.Global.CheckNewVersion {
+		logger.Info().Msg(`Version check is enabled.`)
+		logger.Info().Msg(`Traefik checks for new releases to notify you if your version is out of date.`)
+		logger.Info().Msg(`It also collects usage data during this process.`)
+		logger.Info().Msg(`Check the documentation to get more info: https://doc.traefik.io/traefik/contributing/data-collection/`)
+
+		ticker := time.Tick(24 * time.Hour)
+		safe.Go(func() {
+			for time.Sleep(10 * time.Minute); ; <-ticker {
+				version.CheckNewVersion()
+			}
+		})
+	} else {
+		logger.Info().Msg(`
+Version check is disabled.
+You will not be notified if a new version is available.
+More details: https://doc.traefik.io/traefik/contributing/data-collection/
+`)
+	}
 }
 
 func stats(staticConfiguration *static.Configuration) {