grpc-java-opentelemetry: Add more hints (#30)

Author: DNVindhya

codelabs/grpc-java-opentelemetry/README.md

@@ -156,13 +156,13 @@ With a successful setup, you will see the following output for the server.
 INFO: Server started, listening on 50051
 ```
 
-While, the server is running, on another terminal start client by running:
+While, the server is running, on another terminal start client by running
 
 ```java
 $ ./build/install/start_here/bin/opentelemetry-client world
 ```
 
-A successful run will look like \-
+A successful run will look like
 
 ```
 [date and time]io.grpc.codelabs.opentelemetry.OpenTelemetryClient greet
@@ -176,7 +176,7 @@ INFO: Greeting: Hello world
 Since we have set-up gRPC OpenTelemetry to export metrics using Prometheus. 
 Those metrics will be available on localhost:9464 for server and localhost:9465 for client.
 
-To see client metrics:
+To see client metrics, run
 
 ```shell
 curl localhost:9465/metrics
@@ -340,7 +340,7 @@ tar xvfz prometheus-*.tar.gz
 cd prometheus-*
 ```
 
-Create a prometheus configuration file with the following \-
+Create a prometheus configuration file with the following
 
 ```shell
 cat > grpc_otel_java_prometheus.yml <<EOF
@@ -356,7 +356,7 @@ scrape_configs:
 EOF
 ```
 
-Start prometheus with the new configuration -
+Start prometheus with the new configuration
 
 ```shell
 ./prometheus --config.file=grpc_otel_java_prometheus.yml

codelabs/grpc-java-opentelemetry/start_here/src/main/java/io/grpc/codelabs/opentelemetry/OpenTelemetryClient.java

@@ -110,9 +110,27 @@ public void run() {
     });
 
     ///////////////////////////////////////////////////////////////////////////
-    // CODELAB HINT : Add code to register GrpcOpenTelemetry here.
+    // CODELAB HINT : Add code to create Prometheus exporter here. The default
+    // port has been initialized for you in a variable named prometheusPort.
+    // Please use that while configuring teh exporter.
     ///////////////////////////////////////////////////////////////////////////
 
+    ///////////////////////////////////////////////////////////////////////////
+    // CODELAB HINT : Add code for the following tasks here:
+    // 1. After creating PrometheusHttpServer instance, use that
+    // as a MetricReader to create SdkMeterProvider.
+    // 2. Use newly created SdkMeterProvider to initialize an OpenTelemetrySdk
+    // instance.
+    ///////////////////////////////////////////////////////////////////////////
+
+    ///////////////////////////////////////////////////////////////////////////
+    // CODELAB HINT : Add code for the following tasks here:
+    // 1. Add code to create a GrpcOpenTelemetry instance and
+    // provide the above created OpenTelemetrySdk instance.
+    // 2. Register GrpcOpenTelemetry instance globally.
+    ///////////////////////////////////////////////////////////////////////////
+
+
     // Create a communication channel to the server, known as a Channel.
     ManagedChannel channel = Grpc.newChannelBuilder(target, InsecureChannelCredentials.create())
         .build();

codelabs/grpc-java-opentelemetry/start_here/src/main/java/io/grpc/codelabs/opentelemetry/OpenTelemetryServer.java

@@ -86,7 +86,24 @@ public static void main(String[] args) throws IOException, InterruptedException
     }
 
     ///////////////////////////////////////////////////////////////////////////
-    // CODELAB HINT : Add code to register GrpcOpenTelemetry here.
+    // CODELAB HINT : Add code to create Prometheus exporter here. The default
+    // port has been initialized for you in a variable named prometheusPort.
+    // Please use that while configuring teh exporter.
+    ///////////////////////////////////////////////////////////////////////////
+
+    ///////////////////////////////////////////////////////////////////////////
+    // CODELAB HINT : Add code for the following tasks here:
+    // 1. After creating PrometheusHttpServer instance, use that
+    // as a MetricReader to create SdkMeterProvider.
+    // 2. Use newly created SdkMeterProvider to initialize an OpenTelemetrySdk
+    // instance.
+    ///////////////////////////////////////////////////////////////////////////
+
+    ///////////////////////////////////////////////////////////////////////////
+    // CODELAB HINT : Add code for the following tasks here:
+    // 1. Add code to create a GrpcOpenTelemetry instance and
+    // provide the above created OpenTelemetrySdk instance.
+    // 2. Register GrpcOpenTelemetry instance globally.
     ///////////////////////////////////////////////////////////////////////////
 
     final OpenTelemetryServer server = new OpenTelemetryServer();