updated go azure function example

signalfx · Dec 18, 2024 · ac8b4b9 · ac8b4b9
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diff --git a/instrumentation/go/azure-functions/README.md b/instrumentation/go/azure-functions/README.md
@@ -1 +1,248 @@
-# splunk-opentelemetry-examples
+# Instrumenting a Go Azure Function with OpenTelemetry
+
+This example demonstrates how to instrument an serverless Azure function written in
+Go using OpenTelemetry, and then export the data to Splunk Observability 
+Cloud.  We'll use Go v1.21.4 for this example, but the steps for other Go versions are 
+similar.   
+
+We'll use a custom handler for this example, which is based on 
+[Quickstart: Create a Go or Rust function in Azure using Visual Studio Code](https://learn.microsoft.com/en-us/azure/azure-functions/create-first-function-vs-code-other). 
+
+## Prerequisites 
+
+The following tools are required to deploy Go Azure functions: 
+
+* An Azure account with permissions to create and execute Azure functions
+* [Visual Studio Code](https://code.visualstudio.com/)
+* An OpenTelemetry collector that's accessible to the Azure function 
+* Azure Functions extension for Visual Studio Code (installed using Visual Studio Code)
+
+## Splunk Distribution of the OpenTelemetry Collector
+
+For this example, we deployed the Splunk Distribution of the OpenTelemetry Collector onto a virtual machine 
+in Azure using Gateway mode, and ensured it's accessible to our Azure function. 
+
+We configured it with the `SPLUNK_HEC_TOKEN` and `SPLUNK_HEC_URL` environment variables, so that it 
+exports logs to our Splunk Cloud instance. 
+
+Please refer to [Install the Collector using packages and deployment tools](https://docs.splunk.com/observability/en/gdi/opentelemetry/install-the-collector.html#collector-package-install)
+for collector installation instructions. 
+
+## Application Overview
+
+If you just want to build and deploy the example, feel free to skip this section. 
+
+The application used for this example is a simple Hello World application. 
+
+We updated the [index.js](./src/index.js) file to include code that starts the instrumentation, 
+which adds the Azure function OpenTelemetry instrumentation: 
+
+````
+const sdk = new NodeSDK({
+  traceExporter: new OTLPTraceExporter(),
+  metricReader: new PeriodicExportingMetricReader({
+    exporter: new OTLPMetricExporter(),
+  }),
+  logRecordProcessor: new BatchLogRecordProcessor(
+    new OTLPLogExporter()
+  ),
+  instrumentations: [getNodeAutoInstrumentations(), new AzureFunctionsInstrumentation()],
+});
+sdk.start();
+````
+
+We also modified the 
+[azure-function-Go-opentelemetry-example.js](./src/functions/azure-function-Go-opentelemetry-example.js) 
+file to start a custom span and add a span attribute to it: 
+
+````
+const opentelemetry = require('@opentelemetry/api');
+
+const tracer = opentelemetry.trace.getTracer('azure-function-Go-opentelemetry-example', '0.1.0');
+
+app.http('azure-function-Go-opentelemetry-example', {
+    methods: ['GET', 'POST'],
+    authLevel: 'anonymous',
+    handler: async (request, context) => {
+        return tracer.startActiveSpan('Go-azure-http-trigger', (span) => {
+
+            logger.info(`Http function processed request for url "${request.url}"`);
+
+            const name = request.query.get('name') || 'world';
+            
+            span.setAttribute('app.name', name);
+            span.end();
+
+            return { body: `Hello, ${name}!` };
+        });
+    }
+});
+````
+
+These code changes required the `@splunk/otel`, `@opentelemetry/api` and 
+`@azure/functions-opentelemetry-instrumentation` packages to be installed with npm, which we can see
+in the [package.json](./package.json) file: 
+
+````
+  "dependencies": {
+    "@azure/functions": "^4.5.0",
+    "@azure/functions-opentelemetry-instrumentation": "^0.1.0",
+    "@opentelemetry/api": "^1.9.0",
+    "@opentelemetry/sdk-node": "^0.56.0",
+    "@opentelemetry/sdk-metrics": "^1.29.0",
+    "@opentelemetry/sdk-logs": "^0.56.0",
+    "@opentelemetry/exporter-trace-otlp-http": "^0.56.0",
+    "@opentelemetry/exporter-metrics-otlp-http": "^0.56.0", 
+    "@opentelemetry/exporter-logs-otlp-http": "^0.56.0",
+    "@opentelemetry/auto-instrumentations-node": "^0.54.0",
+    "pino": "^9.5.0"
+  },
+````
+
+For this example, we'll send metrics, traces, and logs to a collector running on another virtual machine in Azure. The [local.settings.json](./local.settings.json) file was updated as follows: 
+
+````
+  "Values": {
+    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
+    "FUNCTIONS_WORKER_RUNTIME": "node",
+    "OTEL_EXPORTER_OTLP_ENDPOINT": "http://<Collector IP Address>:4318", 
+    "OTEL_SERVICE_NAME": "azure-function-Go-opentelemetry-example", 
+    "OTEL_RESOURCE_ATTRIBUTES": "deployment.environment=test" 
+  }
+````
+
+The [host.json](./host.json) file was also updated to set the `telemetryMode` to `openTelemetry`.  This 
+enables OpenTelemetry output from the host where the function runs: 
+
+````
+{
+  "version": "2.0",
+  "logging": {
+    "applicationInsights": {
+      "samplingSettings": {
+        "isEnabled": true,
+        "excludedTypes": "Request"
+      }
+    }
+  },
+  "telemetryMode": "OpenTelemetry",
+  "extensionBundle": {
+    "id": "Microsoft.Azure.Functions.ExtensionBundle",
+    "version": "[4.*, 5.0.0)"
+  }
+````
+
+Note:  while the above setting should be optional, during testing it was observed that 
+application traces don't get captured either if this setting is not included.  
+
+## Build and Deploy
+
+Open the following project using Visual Studio Code: 
+
+````
+splunk-opentelemetry-examples/instrumentation/Go/azure-functions
+````
+
+Then run the following command in a Visual Studio Code terminal to build the application: 
+
+````
+go build handler.go
+````
+
+To run the function locally, use: 
+
+````
+func start
+````
+
+Before we deploy the function to Azure, we need to compile the custom handler by
+running the following command using the integrated terminal in VS Code: 
+
+````
+GOOS=linux GOARCH=amd64 go build handler.go
+````
+
+Note:  the above command is for Mac OS.  For other operating systems, please refer 
+to [Compile the custom handler for Azure](https://learn.microsoft.com/en-us/azure/azure-functions/create-first-function-vs-code-other?tabs=go%2Cmacos#compile-the-custom-handler-for-azure)
+
+### Create a Function App in Azure 
+
+Create a Function App in Azure if you don't already have one.  For my example, 
+I used `opentelemetry-Go-examples` as the function name, and used the region of “West US 2” 
+with Go v20 as the runtime. 
+
+![Azure Function App](./images/azure-function-app.png)
+
+### Create a Deployment Slot (Optional) 
+
+By default, Azure will use a deployment slot named "Production" for an Azure Function App.  
+In my example, I created a deployment slot named "test".
+
+![Deployment Slot](./images/deployment-slot.png)
+
+### Set Environment Variables 
+
+To allow OpenTelemetry to send trace data to Splunk Observability Cloud, 
+we need to set the `OTEL_EXPORTER_OTLP_ENDPOINT`, `OTEL_SERVICE_NAME`, 
+and `OTEL_RESOURCE_ATTRIBUTES` environment variables 
+for our Azure Function App: 
+
+![Environment Variables](./images/env-vars.png)
+
+### Build and Deploy the Azure Function
+
+In the Azure section of Visual Studio Code, right click on the deployment slot of interest 
+and select `Deploy to Slot`. 
+
+<img src="./images/deploy.png" alt="Deploy" width="200"/>
+
+It will ask you to confirm: 
+
+<img src="./images/confirm-deploy.png" alt="Confirm Deploy" width="200"/>
+
+### Test the Azure Function
+
+Copy the function URL from the Azure function: 
+
+<img src="./images/function-url.png" alt="Function URL" width="200"/>
+
+Then point your browser to that URL, it should return: 
+
+````
+Hello, World! 
+````
+
+### View Traces in Splunk Observability Cloud
+
+After a minute or so, you should start to see traces for the serverless function
+appearing in Splunk Observability Cloud: 
+
+![Trace](./images/trace.png)
+
+Note that the bottom-right of the trace includes a button that links to the related log entries. 
+
+### Add Trace Context to Logs
+
+Logs generated by an Azure function get sent to Application Insights.
+Various methods exist for ingesting logs into Splunk platform from Application Insights,
+such as the 
+[Splunk Add-on for Microsoft Cloud Services](https://splunkbase.splunk.com/app/3110).
+
+Once the logs are in Splunk platform, they can be made available to
+Splunk Observability Cloud using Log Observer Connect.
+
+In general, logs generated by an Azure function get sent to Application Insights.
+Various methods exist for ingesting logs into Splunk platform from Application Insights,
+such as the 
+[Splunk Add-on for Microsoft Cloud Services](https://splunkbase.splunk.com/app/3110).
+
+In this example, OpenTelemetry Go also exports logs 
+to our collector using OTLP.  
+
+By following the link from the trace show above, we can see all of the log entries associated 
+with this trace: 
+
+![Related Logs](./images/related-logs.png)
+
+We can see that the log entries include a trace_id and span_id, which allows us to correlate 
+logs with traces. 
diff --git a/instrumentation/go/azure-functions/go.mod b/instrumentation/go/azure-functions/go.mod
@@ -0,0 +1,48 @@
+module example.com/azure_function_go_opentelemetry_example
+
+go 1.22.7
+
+toolchain go1.22.10
+
+require (
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-logr/zapr v1.3.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0 // indirect
+	github.com/signalfx/splunk-otel-go/distro v1.23.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/runtime v0.58.0 // indirect
+	go.opentelemetry.io/contrib/propagators/autoprop v0.58.0 // indirect
+	go.opentelemetry.io/contrib/propagators/aws v1.33.0 // indirect
+	go.opentelemetry.io/contrib/propagators/b3 v1.33.0 // indirect
+	go.opentelemetry.io/contrib/propagators/jaeger v1.33.0 // indirect
+	go.opentelemetry.io/contrib/propagators/ot v1.33.0 // indirect
+	go.opentelemetry.io/otel v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/jaeger v1.17.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.9.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.33.0 // indirect
+	go.opentelemetry.io/otel/log v0.9.0 // indirect
+	go.opentelemetry.io/otel/metric v1.33.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.33.0 // indirect
+	go.opentelemetry.io/otel/sdk/log v0.9.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.33.0 // indirect
+	go.opentelemetry.io/otel/trace v1.33.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.4.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	golang.org/x/net v0.32.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20241209162323-e6fa225c2576 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20241209162323-e6fa225c2576 // indirect
+	google.golang.org/grpc v1.69.0 // indirect
+	google.golang.org/protobuf v1.35.2 // indirect
+)
diff --git a/instrumentation/go/azure-functions/go.sum b/instrumentation/go/azure-functions/go.sum
@@ -0,0 +1,81 @@
+github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
+github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/go-logr/zapr v1.3.0 h1:XGdV8XW8zdwFiwOA2Dryh1gj2KRQyOOoNmBy4EplIcQ=
+github.com/go-logr/zapr v1.3.0/go.mod h1:YKepepNBd1u/oyhd/yQmtjVXmm9uML4IXUgMOwR8/Gg=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0 h1:TmHmbvxPmaegwhDubVz0lICL0J5Ka2vwTzhoePEXsGE=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0/go.mod h1:qztMSjm835F2bXf+5HKAPIS5qsmQDqZna/PgVt4rWtI=
+github.com/signalfx/splunk-otel-go/distro v1.23.0 h1:cNoVuPaaPOZbwjcyI7gG2M+bCQXZNTl9ev0SFU7Pbko=
+github.com/signalfx/splunk-otel-go/distro v1.23.0/go.mod h1:yDKt8QeGUMaYvSX7fRQZ9iKo6ZveSlr+L1NRD88UKVw=
+go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0 h1:yd02MEjBdJkG3uabWP9apV+OuWRIXGDuJEUJbOHmCFU=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0/go.mod h1:umTcuxiv1n/s/S6/c2AT/g2CQ7u5C59sHDNmfSwgz7Q=
+go.opentelemetry.io/contrib/instrumentation/runtime v0.58.0 h1:GrcF8ABgnBHQFgp4zu5/jTSqLkoJ9uiDz2e7eKkjq+w=
+go.opentelemetry.io/contrib/instrumentation/runtime v0.58.0/go.mod h1:+kxR5prZLoFAJVXJWZKWO2e4PY2dYyXIRNklBuOyzpM=
+go.opentelemetry.io/contrib/propagators/autoprop v0.58.0 h1:pL1MMoBcG/ol6fVsjE1bbOO9A8GMQiN+T73hnmaXDoU=
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+go.opentelemetry.io/contrib/propagators/aws v1.33.0 h1:MefPfPIut0IxEiQRK1qVv5AFADBOwizl189+m7QhpFg=
+go.opentelemetry.io/contrib/propagators/aws v1.33.0/go.mod h1:VB6xPo12uW/PezOqtA/cY2/DiAGYshnhID606wC9NEY=
+go.opentelemetry.io/contrib/propagators/b3 v1.33.0 h1:ig/IsHyyoQ1F1d6FUDIIW5oYpsuTVtN16AyGOgdjAHQ=
+go.opentelemetry.io/contrib/propagators/b3 v1.33.0/go.mod h1:EsVYoNy+Eol5znb6wwN3XQTILyjl040gUpEnUSNZfsk=
+go.opentelemetry.io/contrib/propagators/jaeger v1.33.0 h1:Jok/dG8kfp+yod29XKYV/blWgYPlMuRUoRHljrXMF5E=
+go.opentelemetry.io/contrib/propagators/jaeger v1.33.0/go.mod h1:ku/EpGk44S5lyVMbtJRK2KFOnXEehxf6SDnhu1eZmjA=
+go.opentelemetry.io/contrib/propagators/ot v1.33.0 h1:xj/pQFKo4ROsx0v129KpLgFwaYMgFTu3dAMEEih97cY=
+go.opentelemetry.io/contrib/propagators/ot v1.33.0/go.mod h1:/xxHCLhTmaypEFwMViRGROj2qgrGiFrkxIlATt0rddc=
+go.opentelemetry.io/otel v1.33.0 h1:/FerN9bax5LoK51X/sI0SVYrjSE0/yUL7DpxW4K3FWw=
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+go.opentelemetry.io/otel/metric v1.33.0 h1:r+JOocAyeRVXD8lZpjdQjzMadVZp2M4WmQ+5WtEnklQ=
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