feat: add version metric (#20)

cmd/cosmos-node-exporter.go

@@ -24,7 +24,7 @@ func Execute(configPath string) {
 	}
 
 	log := logger.GetLogger(appConfig.LogConfig)
-	app := pkg.NewApp(log, appConfig)
+	app := pkg.NewApp(log, appConfig, version)
 
 	http.HandleFunc("/metrics", func(w http.ResponseWriter, r *http.Request) {
 		app.HandleRequest(w, r)

pkg/app.go

@@ -5,6 +5,7 @@ import (
 	"main/pkg/constants"
 	cosmovisorPkg "main/pkg/cosmovisor"
 	githubPkg "main/pkg/github"
+	"main/pkg/queriers/app"
 	nodeStats "main/pkg/queriers/node_stats"
 	"main/pkg/queriers/upgrades"
 	"main/pkg/queriers/versions"
@@ -25,11 +26,13 @@ import (
 type App struct {
 	Logger   zerolog.Logger
 	Queriers []types.Querier
+	Version  string
 }
 
 func NewApp(
 	logger *zerolog.Logger,
 	config *config.Config,
+	version string,
 ) *App {
 	appLogger := logger.With().Str("component", "app").Logger()
 
@@ -53,6 +56,7 @@ func NewApp(
 		nodeStats.NewQuerier(logger, tendermintRPC),
 		versions.NewQuerier(logger, github, cosmovisor),
 		upgrades.NewQuerier(config, logger, cosmovisor, tendermintRPC),
+		app.NewQuerier(version),
 	}
 
 	for _, querier := range queriers {
@@ -66,6 +70,7 @@ func NewApp(
 	return &App{
 		Logger:   appLogger,
 		Queriers: queriers,
+		Version:  version,
 	}
 }
 

pkg/queriers/app/querier.go

@@ -0,0 +1,42 @@
+package app
+
+import (
+	"main/pkg/constants"
+	"main/pkg/query_info"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type Querier struct {
+	Version string
+}
+
+func NewQuerier(version string) *Querier {
+	return &Querier{
+		Version: version,
+	}
+}
+
+func (u *Querier) Enabled() bool {
+	return true
+}
+
+func (u *Querier) Name() string {
+	return "app-querier"
+}
+
+func (u *Querier) Get() ([]prometheus.Collector, []query_info.QueryInfo) {
+	appVersionGauge := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: constants.MetricsPrefix + "version",
+			Help: "The app info and version.",
+		},
+		[]string{"version"},
+	)
+
+	appVersionGauge.
+		With(prometheus.Labels{"version": u.Version}).
+		Set(1)
+
+	return []prometheus.Collector{appVersionGauge}, []query_info.QueryInfo{}
+}