Distributed Tracing sample for Azure Functions, and Java with Application Insights

Sample project for developing Distributed Tracing. We are using these technologies.

• Azure Functions V2
• Storage Queue
• Spring boot
• Service Bus
• Durable Functions (Next Step)
• Application Insights

Features

You can learn how to implement Distributed Tracing using Application Insights and Azure Functions.

Storage Queue -> Azure Functions (1) -> Http Request -> Spring boot -> Service Bus -> Azure Functions (2) -> Service Bus -> Azure Functions (3) 

How to use

Prerequisite

Azure Functions V2 development Enviornment wich C#

• Create your first function using Visual Studio
• Create your first function using Visual Studio Code

Storage Emulator

For local development, Use Storage Emulator. Start the emulator.

• Use the Azure storage emulator for development and testing

If you are using Mac, I recommend to use Azurite as a storage emulator.

Java SE Development Kit 8

Download and install it.

• Java SE Development Kit 8

Start application

Create an Application Insights on Azure Portal

Create an Application Insights on Azure Protal. Then get InstrumentationKey.

Create local.settings.json

Copy the local.settings.json.example to local.settings.json then chenge the value of APPINSIGHTS_INSTRUMENTATIONKEY to fit your InstrumentationKey of the ApplicationInsights.

Define local.settings.json in FunctionsSample.csproj

For example,

<None Update="local.settings.json">
    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    <CopyToPublishDirectory>Never</CopyToPublishDirectory>
</None>

Start Azure Functions

Start the Azure Functions. In case of Visual Studio, Hit F5. In case of Visual Studio Code, Open Visual Studio Code on the FunctionsSample/FunctionsSample directory. Then click Debug Attach to C# Functions.

Create ApplicationInsights.xml

Copy the ApplicationInsights.xml then fill the InstrumentKey part from your Application Insights instrument key. Also, I recommend to create set_environment.sh from the set_environment.sh.example. However, ApplicationInsights.xml might be enough.

Start Java Application

Go to the JavaSample directory, then gradlew bootRun

Send request to the first function.

Just send get request by postman or something.

http://localhost:7071/api/StartOperation

You will see the telemetry is sending to the Application Insights, and you will see the Parent Request-Id on the Java Application console and current RequestTelemtryId on your terminal.

Parent Request-Id: |gqHOHSfsTMY=.bc503bfa_1.bc503c00_1.
Current Request Id: |gqHOHSfsTMY=.bc503bfa_1.bc503c00_1.5f667911_ RootId: gqHOHSfsTMY= ParentId: |gqHOHSfsTMY=.bc503b
fa_1.bc503c00_1.

like this. After 5 min, you can find the telemetry is on your Application Insigts, Application Map.

TODO

Now we almost done. Generate Request/Dependency Telemetry and send it to the Application Insights and make sure it works. However something is remains.

• Sending ParentId to the ServiceBus
• Create a Service Bus Trigger Azure Functions and send the following ServiceBus trigger functions.
• W3C TraceContext correlation sample