feat: add version metric

Makefile

@@ -35,8 +35,8 @@ GIT_COMMIT = $(shell git rev-parse --short HEAD)
 VERSION = $(shell cat ./VERSION)
 
 BUILD_FLAGS ?= $(shell echo "-ldflags='\
-	-X github.com/waku-org/waku/v2/node.GitCommit=$(GIT_COMMIT) \
-	-X github.com/waku-org/waku/v2/node.Version=$(VERSION)'")
+	-X github.com/waku-org/go-waku/waku/v2/node.GitCommit=$(GIT_COMMIT) \
+	-X github.com/waku-org/go-waku/waku/v2/node.Version=$(VERSION)'")
 
 
 # control rln code compilation

waku/metrics/http.go

@@ -57,6 +57,7 @@ func NewMetricsServer(address string, port int, log *zap.Logger) *Server {
 		metrics.StoreMessagesView,
 		metrics.PeersView,
 		metrics.DialsView,
+		metrics.VersionView,
 	); err != nil {
 		p.log.Fatal("registering views", zap.Error(err))
 	}

waku/node.go

@@ -14,6 +14,8 @@ import (
 	"syscall"
 	"time"
 
+	wmetrics "github.com/waku-org/go-waku/waku/v2/metrics"
+
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -78,6 +80,8 @@ const dialTimeout = 7 * time.Second
 
 // Execute starts a go-waku node with settings determined by the Options parameter
 func Execute(options Options) {
+	utils.Logger().Info("Version details ", zap.String("version", node.Version), zap.String("commit", node.GitCommit))
+
 	if options.GenerateKey {
 		if err := writePrivateKeyToFile(options.KeyFile, []byte(options.KeyPasswd), options.Overwrite); err != nil {
 			failOnErr(err, "nodekey error")
@@ -118,6 +122,7 @@ func Execute(options Options) {
 	if options.Metrics.Enable {
 		metricsServer = metrics.NewMetricsServer(options.Metrics.Address, options.Metrics.Port, logger)
 		go metricsServer.Start()
+		wmetrics.RecordVersion(context.Background(), node.Version, node.GitCommit)
 	}
 
 	nodeOpts := []node.WakuNodeOption{

waku/v2/metrics/metrics.go

@@ -2,6 +2,7 @@ package metrics
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/waku-org/go-waku/waku/v2/utils"
 	"go.opencensus.io/stats"
@@ -11,6 +12,7 @@ import (
 )
 
 var (
+	WakuVersion         = stats.Int64("waku_version", "", stats.UnitDimensionless)
 	Messages            = stats.Int64("node_messages", "Number of messages received", stats.UnitDimensionless)
 	Peers               = stats.Int64("peers", "Number of connected peers", stats.UnitDimensionless)
 	Dials               = stats.Int64("dials", "Number of peer dials", stats.UnitDimensionless)
@@ -22,8 +24,9 @@ var (
 )
 
 var (
-	KeyType, _   = tag.NewKey("type")
-	ErrorType, _ = tag.NewKey("error_type")
+	KeyType, _    = tag.NewKey("type")
+	ErrorType, _  = tag.NewKey("error_type")
+	GitVersion, _ = tag.NewKey("git_version")
 )
 
 var (
@@ -72,6 +75,13 @@ var (
 		Aggregation: view.Count(),
 		TagKeys:     []tag.Key{ErrorType},
 	}
+	VersionView = &view.View{
+		Name:        "gowaku_version",
+		Measure:     WakuVersion,
+		Description: "The gowaku version",
+		Aggregation: view.LastValue(),
+		TagKeys:     []tag.Key{GitVersion},
+	}
 )
 
 func RecordLightpushError(ctx context.Context, tagType string) {
@@ -97,3 +107,10 @@ func RecordStoreError(ctx context.Context, tagType string) {
 		utils.Logger().Error("failed to record with tags", zap.Error(err))
 	}
 }
+
+func RecordVersion(ctx context.Context, version string, commit string) {
+	v := fmt.Sprintf("%s-%s", version, commit)
+	if err := stats.RecordWithTags(ctx, []tag.Mutator{tag.Insert(GitVersion, v)}, WakuVersion.M(1)); err != nil {
+		utils.Logger().Error("failed to record with tags", zap.Error(err))
+	}
+}

waku/v2/node/wakunode2.go

@@ -259,8 +259,6 @@ func (w *WakuNode) checkForAddressChanges() {
 
 // Start initializes all the protocols that were setup in the WakuNode
 func (w *WakuNode) Start() error {
-	w.log.Info("Version details ", zap.String("commit", GitCommit), zap.String("version", Version))
-
 	if w.opts.enableSwap {
 		w.swap = swap.NewWakuSwap(w.log, []swap.SwapOption{
 			swap.WithMode(w.opts.swapMode),