add build info metrics (#7525)

* add build info metrics

* unused

* metrics on build

* size limit

* once

weed/util/version/constants.go

@@ -3,6 +3,7 @@ package version
 import (
 	"fmt"
 
+	"github.com/seaweedfs/seaweedfs/weed/stats"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
@@ -14,6 +15,11 @@ var (
 	COMMIT         = ""
 )
 
+func init() {
+	// Set version info in stats for Prometheus metrics
+	stats.SetVersionInfo(VERSION_NUMBER, COMMIT, util.SizeLimit)
+}
+
 func Version() string {
 	return VERSION + " " + COMMIT
 }