Move register exporter to metrics file

cmd/ipfs/daemon.go

@@ -649,6 +649,7 @@ func serveHTTPApi(req *cmds.Request, cctx *oldcmds.Context) (<-chan error, error
 	var opts = []corehttp.ServeOption{
 		corehttp.MetricsCollectionOption("api"),
 		corehttp.MetricsOpenCensusCollectionOption(),
+		corehttp.MetricsOpenCensusDefaultPrometheusRegistry(),
 		corehttp.CheckVersionOption(),
 		corehttp.CommandsOption(*cctx),
 		corehttp.WebUIOption,

core/corehttp/metrics.go

@@ -51,6 +51,30 @@ func MetricsOpenCensusCollectionOption() ServeOption {
 	}
 }
 
+// MetricsOpenCensusDefaultPrometheusRegistry registers the default prometheus
+// registry as an exporter to OpenCensus metrics. This means that OpenCensus
+// metrics will show up in the prometheus metrics endpoint
+func MetricsOpenCensusDefaultPrometheusRegistry() ServeOption {
+	return func(_ *core.IpfsNode, _ net.Listener, mux *http.ServeMux) (*http.ServeMux, error) {
+		log.Info("Init OpenCensus with default prometheus registry")
+
+		pe, err := ocprom.NewExporter(ocprom.Options{
+			Registry: prometheus.DefaultRegisterer.(*prometheus.Registry),
+			OnError: func(err error) {
+				log.Errorw("OC default registry ERROR", "error", err)
+			},
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		// register prometheus with opencensus
+		view.RegisterExporter(pe)
+
+		return mux, nil
+	}
+}
+
 // MetricsCollectionOption adds collection of net/http-related metrics.
 func MetricsCollectionOption(handlerName string) ServeOption {
 	return func(_ *core.IpfsNode, _ net.Listener, mux *http.ServeMux) (*http.ServeMux, error) {

core/node/libp2p/rcmgr.go

@@ -7,7 +7,6 @@ import (
 	"path/filepath"
 	"strings"
 
-	ocprom "contrib.go.opencensus.io/exporter/prometheus"
 	"github.com/benbjohnson/clock"
 	logging "github.com/ipfs/go-log/v2"
 	config "github.com/ipfs/kubo/config"
@@ -21,7 +20,6 @@ import (
 	rcmgr "github.com/libp2p/go-libp2p-resource-manager"
 	rcmgrObs "github.com/libp2p/go-libp2p-resource-manager/obs"
 	"github.com/multiformats/go-multiaddr"
-	"github.com/prometheus/client_golang/prometheus"
 	"go.opencensus.io/stats/view"
 
 	"go.uber.org/fx"
@@ -86,18 +84,10 @@ func ResourceManager(cfg config.SwarmConfig) interface{} {
 				log.Infof("Setting allowlist to: %v", mas)
 			}
 
-			// Hook up the trace reporter metrics
-			err = view.Register(rcmgrObs.DefaultViews...)
+			view.Register(rcmgrObs.DefaultViews...)
 			if err != nil {
 				return nil, opts, fmt.Errorf("registering rcmgr obs views: %w", err)
 			}
-			_, err = ocprom.NewExporter(ocprom.Options{
-				Registry:  prometheus.DefaultRegisterer.(*prometheus.Registry),
-				Namespace: "rcmgr_trace_metrics",
-			})
-			if err != nil {
-				return nil, opts, fmt.Errorf("creating new prom exporter: %w", err)
-			}
 
 			if os.Getenv("LIBP2P_DEBUG_RCMGR") != "" {
 				traceFilePath := filepath.Join(repoPath, NetLimitTraceFilename)