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+# Collecting and generating telemetry
+
+Deploy Prometheus, service monitors and Grafana:
+```shell
+bazel run config/prometheus:everything.create
+bazel run config/grafana:everything.create
+bazel run config/grafana:everything-public.create
+```
+
+To see pre-installed system dashboards, find the public IP that Grafana is exposed on:
+
+```shell
+# Put the Ingress IP into an environment variable.
+$ kubectl get service grafana-public -o jsonpath="{.status.loadBalancer.ingress[*]['ip']}"
+```
+
+And browse to <IP_ADDRESS>:30802.
+
+**Above installs Grafana with a hard coded admin username (_admin_) and password (_admin_) 
+and publishes it on a public IP. This should only be done in a development environment with no sensitive data.**
+
+## Troubleshooting
+
+You can expose Prometheus UI to troubleshoot metric publishing or service discovery issues:
+
+```shell
+bazel run config/prometheus:everything-public.create
+```
+
+**Run this only in a development environment with no sensitive data. This step enables viewing all metrics on a public IP without any authorization.**
+
+Wait until the load balancer IP is created and then copy the IP address:
+
+```shell
+# Put the Ingress IP into an environment variable.
+$ kubectl get service prometheus-system-public -o jsonpath="{.status.loadBalancer.ingress[*]['ip']}"
+```
+
+And browse to <IP_ADDRESS>:30800.
+
+## Generating metrics
+
+See [Telemetry Sample](../sample/telemetrysample/README.md) for deploying a dedicated instance of Prometheus 
+and emitting metrics to it.
+
+If you want to generate metrics within Elafros services and send them to shared instance of Prometheus, 
+follow the steps below. We will create a counter metric below:
+1. Go through [Prometheus Documentation](https://prometheus.io/docs/introduction/overview/) 
+and read [Data model](https://prometheus.io/docs/concepts/data_model/) and [Metric types](https://prometheus.io/docs/concepts/metric_types/) sections.
+2. Create a top level variable in your go file and initialize it in init() - example:
+
+```go
+    import "github.com/prometheus/client_golang/prometheus"
+    
+    var myCounter = prometheus.NewCounterVec(prometheus.CounterOpts{
+        Namespace: "elafros",
+        Name:      "mycomponent_something_count",
+        Help:      "Counter to keep track of something in my component",
+    }, []string{"status"})
+    
+    func init() {
+        prometheus.MustRegister(myCounter)
+    }
+```
+3. In your code where you want to instrument, increment the counter with the appropriate label values - example:
+
+```go
+    err := doSomething()
+    if err == nil {
+        myCounter.With(prometheus.Labels{"status": "success"}).Inc()
+    } else {
+        myCounter.With(prometheus.Labels{"status": "failure"}).Inc()
+    }
+```
+4. Start an http listener to serve as the metrics endpoint for Prometheus scraping (_this step and onwards are needed 
+only once in a service. ela-controller is already setup for metrics scraping and you can skip rest of these steps
+if you are targeting ela-controller_):
+
+```go
+    import "github.com/prometheus/client_golang/prometheus/promhttp"
+    
+    // In your main() func
+    srv := &http.Server{Addr: ":9090"}
+    http.Handle("/metrics", promhttp.Handler())
+    go func() {
+        if err := srv.ListenAndServe(); err != nil {
+            glog.Infof("Httpserver: ListenAndServe() finished with error: %s", err)
+        }
+    }()
+
+    // Wait for the service to shutdown
+    <-stopCh
+
+    // Close the http server gracefully
+    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+    defer cancel()
+    srv.Shutdown(ctx)
+
+```
+
+5. Add a Service for the metrics http endpoint:
+
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: myappname
+    prometheus: myappname
+  name: myappname
+  namespace: mynamespace
+spec:
+  ports:
+  - name: metrics
+    port: 9090
+    protocol: TCP
+    targetPort: 9090
+  selector:
+    app: myappname # put the appropriate value here to select your application
+```
+
+6. Add a ServiceMonitor to tell Prometheus to discover pods and scrape the service defined above:
+
+```yaml
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: myappname
+  labels:
+    monitor-category: ela-system # Shared Prometheus instance only targets 'k8s', 'istio', 'node',
+                                 # 'prometheus' or 'ela-system' - if you pick something else, 
+                                 # you need to deploy your own Prometheus instance or edit shared
+                                 # instance to target the new category
+spec:
+  selector:
+    matchLabels:
+      app: myappname
+      prometheus: myappname
+  namespaceSelector:
+    matchNames:
+    - mynamespace
+  endpoints:
+  - port: metrics
+    interval: 30s
+```
+
+7. Add a dashboard for your metrics - you can see examples of it under 
+config/grafana/dashboard-definition folder. An easy way to generate JSON 
+definitions is to use Grafana UI (make sure to login with as admin user) and export JSON from it.
+
+8. Add the YAML files to BUILD files.
+
+9. Deploy changes with bazel.
+
+10. Validate the metrics flow either by Grafana UI or Prometheus UI (see Troubleshooting section 
+above to enable Prometheus UI)
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