From 6b3c7de72765cc9fbb1efc9210b46c839f4afcd1 Mon Sep 17 00:00:00 2001
From: Julius Volz <julius@soundcloud.com>
Date: Tue, 7 Jul 2015 23:29:59 -0600
Subject: [PATCH] Export build information as metric.

There is more build information that could be put into labels, but
Version, Revision, and Branch seemed like the right level of detail to
me.
---
 version/info.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/version/info.go b/version/info.go
index 7c1f57227..835fc5ce6 100644
--- a/version/info.go
+++ b/version/info.go
@@ -13,6 +13,8 @@
 
 package version
 
+import "github.com/prometheus/client_golang/prometheus"
+
 // Build information. Populated at build-time.
 var (
 	Version   string
@@ -32,3 +34,16 @@ var Map = map[string]string{
 	"buildDate": BuildDate,
 	"goVersion": GoVersion,
 }
+
+func init() {
+	buildInfo := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "prometheus_build_info",
+			Help: "A metric with a constant '1' value labeled by version, revision, and branch from which Prometheus was built.",
+		},
+		[]string{"version", "revision", "branch"},
+	)
+	buildInfo.WithLabelValues(Version, Revision, Branch).Set(1)
+
+	prometheus.MustRegister(buildInfo)
+}