Add Grafana dashboard

obs/grafana-dashboards/README.md

@@ -0,0 +1,42 @@
+# Ready to go Grafana Dashboard
+
+Here are some prebuilt dashboards that you can add to your Grafana instance. To
+import follow the Grafana docs [here](https://grafana.com/docs/grafana/latest/dashboards/export-import/#import-dashboard)
+
+## Setup
+
+To make sure you're emitting the correct metrics you'll have to hook up the
+Opencensus views that `stats.go` exports. For Prometheus this looks like:
+
+``` go
+import (
+    // ...
+	ocprom "contrib.go.opencensus.io/exporter/prometheus"
+
+	rcmgr "github.com/libp2p/go-libp2p-resource-manager"
+	rcmgrObs "github.com/libp2p/go-libp2p-resource-manager/obs"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"go.opencensus.io/stats/view"
+)
+
+    func SetupResourceManager() (network.ResourceManager, error) {
+        // Hook up the trace reporter metrics
+        view.Register(rcmgrObs.DefaultViews...)
+        ocprom.NewExporter(ocprom.Options{
+            Registry:  prometheus.DefaultRegisterer.(*prometheus.Registry),
+            Namespace: "rcmgr_trace_metrics",
+        })
+
+        str, err := rcmgrObs.NewStatsTraceReporter()
+        if err != nil {
+            return nil, err
+        }
+
+        return rcmgr.NewResourceManager(limiter, rcmgr.WithTraceReporter(str))
+    }
+```
+
+It should be fairly similar for other exporters. See the [OpenCensus
+docs](https://opencensus.io/exporters/supported-exporters/go/) to see how to
+export to another exporter.