Add version information

version/info.go

@@ -0,0 +1,49 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package version
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// Build information. Populated at build-time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+	GoVersion string
+)
+
+// Map provides the iterable version information.
+var Map = map[string]string{
+	"version":   Version,
+	"revision":  Revision,
+	"branch":    Branch,
+	"buildUser": BuildUser,
+	"buildDate": BuildDate,
+	"goVersion": GoVersion,
+}
+
+func init() {
+	buildInfo := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "alertmanager_build_info",
+			Help: "A metric with a constant '1' value labeled by version, revision, and branch from which Alertmanager was built.",
+		},
+		[]string{"version", "revision", "branch"},
+	)
+	buildInfo.WithLabelValues(Version, Revision, Branch).Set(1)
+
+	prometheus.MustRegister(buildInfo)
+}