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Application Insights for apps in Azure - Cheat Sheet & Quick Revision

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beginner
What is Application Insights in Azure?
Application Insights is a service that helps you monitor your app's performance and usage. It collects data like errors, requests, and user activity to help you understand how your app works.
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beginner
How does Application Insights collect data from your app?
It uses a small piece of code called an SDK or an agent that you add to your app. This code sends information about your app's behavior to Azure Monitor for analysis.
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intermediate
What types of data can Application Insights track?
It tracks requests, exceptions (errors), performance metrics, dependencies (calls to other services), and user behavior like page views and sessions.
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beginner
Why is Application Insights useful for app developers?
It helps developers find and fix problems quickly, understand how users interact with the app, and improve app performance and reliability.
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beginner
What is an Application Insights resource in Azure?
It is a container in Azure Monitor where all the monitoring data for your app is stored and analyzed. You create this resource to start collecting data.
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What is the main purpose of Application Insights?
ATo store app source code
BTo monitor app performance and usage
CTo host web applications
DTo manage user authentication
Which of the following data types does Application Insights NOT track?
ADatabase schema changes
BApp exceptions
CUser sessions
DRequest performance
How do you enable Application Insights in your app?
ABy adding an SDK or agent to your app
BBy creating a virtual machine
CBy writing SQL queries
DBy configuring DNS settings
Where is Application Insights data stored?
AIn a local database
BOn the user's device
CIn an Azure Application Insights resource
DIn a GitHub repository
Which benefit does Application Insights provide to developers?
AHosts app databases
BAutomatically writes app code
CManages app billing
DHelps find and fix app problems quickly
Explain how Application Insights helps improve an app's performance and user experience.
Think about what data it collects and how that data helps developers.
You got /4 concepts.
    Describe the steps to set up Application Insights for a new web application.
    Consider both Azure setup and app code changes.
    You got /4 concepts.

      Practice

      (1/5)
      1. What is the main purpose of Azure Application Insights?
      easy
      A. To monitor the health and usage of applications
      B. To create virtual machines in Azure
      C. To store large amounts of data
      D. To manage user identities and access

      Solution

      1. Step 1: Understand Application Insights role

        Application Insights is designed to monitor apps by collecting data about their performance and usage.

      2. Step 2: Compare with other Azure services

        Other options like virtual machines, data storage, or identity management are handled by different Azure services.

      3. Final Answer:

        To monitor the health and usage of applications -> Option A

      4. Quick Check:

        Monitoring apps = To monitor the health and usage of applications [OK]
      Hint: Think monitoring and diagnostics for apps [OK]
      Common Mistakes:
      • Confusing Application Insights with storage services
      • Mixing it up with Azure Active Directory
      • Assuming it creates or manages infrastructure
      2. Which of the following is the correct way to enable Application Insights in an Azure Web App?
      easy
      A. Create a virtual machine and install Application Insights manually
      B. Add Application Insights SDK and configure instrumentation key
      C. Enable Azure Monitor logs only
      D. Use Azure Blob Storage to store telemetry data

      Solution

      1. Step 1: Identify how to enable Application Insights

        Enabling Application Insights requires adding its SDK to the app and setting the instrumentation key for telemetry.

      2. Step 2: Eliminate incorrect options

        Creating VMs or using Blob Storage does not enable Application Insights. Azure Monitor logs are related but separate.

      3. Final Answer:

        Add Application Insights SDK and configure instrumentation key -> Option B

      4. Quick Check:

        SDK + instrumentation key = Add Application Insights SDK and configure instrumentation key [OK]
      Hint: SDK plus key enables monitoring [OK]
      Common Mistakes:
      • Thinking Application Insights runs on VMs only
      • Confusing Azure Monitor logs with Application Insights
      • Using storage services for telemetry data
      3. Given this snippet in an Azure Function app:
      var telemetryClient = new TelemetryClient();
telemetryClient.TrackEvent("OrderPlaced");

      What will Application Insights record?
      medium
      A. An error log with message 'OrderPlaced'
      B. A performance metric for function execution time
      C. An event named 'OrderPlaced' in the telemetry data
      D. No data because TelemetryClient is not initialized

      Solution

      1. Step 1: Understand TrackEvent method

        TrackEvent sends a custom event named as the string argument to Application Insights.

      2. Step 2: Check the code behavior

        The code creates a TelemetryClient and tracks an event called 'OrderPlaced', so this event will be recorded.

      3. Final Answer:

        An event named 'OrderPlaced' in the telemetry data -> Option C

      4. Quick Check:

        TrackEvent sends event = An event named 'OrderPlaced' in the telemetry data [OK]
      Hint: TrackEvent logs custom events [OK]
      Common Mistakes:
      • Assuming TrackEvent logs errors
      • Thinking it measures performance automatically
      • Believing TelemetryClient needs extra setup to send events
      4. You added Application Insights to your app but see no telemetry data in the Azure portal. What is the most likely cause?
      medium
      A. Application Insights service is not available in your region
      B. Azure subscription is expired
      C. You need to restart the Azure portal
      D. Instrumentation key is missing or incorrect in app configuration

      Solution

      1. Step 1: Check telemetry data flow requirements

        Telemetry requires the correct instrumentation key configured in the app to send data to Application Insights.

      2. Step 2: Evaluate other options

        Subscription expiry or service region issues would cause broader failures, and restarting the portal does not affect telemetry data.

      3. Final Answer:

        Instrumentation key is missing or incorrect in app configuration -> Option D

      4. Quick Check:

        Missing key blocks telemetry = Instrumentation key is missing or incorrect in app configuration [OK]
      Hint: Check instrumentation key first [OK]
      Common Mistakes:
      • Restarting portal expecting data to appear
      • Assuming regional availability blocks telemetry silently
      • Ignoring app configuration settings
      5. You want to monitor a multi-service app with Application Insights and correlate requests across services. What should you do?
      hard
      A. Enable distributed tracing and use the same Application Insights resource for all services
      B. Create separate Application Insights resources for each service without linking
      C. Use Azure Monitor logs only without Application Insights
      D. Send telemetry data manually to a storage account

      Solution

      1. Step 1: Understand distributed tracing in Application Insights

        Distributed tracing allows tracking requests across multiple services by sharing context and using the same Application Insights resource.

      2. Step 2: Compare options for multi-service monitoring

        Using separate resources without linking breaks correlation. Azure Monitor logs alone do not provide this tracing. Manual telemetry to storage lacks correlation features.

      3. Final Answer:

        Enable distributed tracing and use the same Application Insights resource for all services -> Option A

      4. Quick Check:

        Distributed tracing + shared resource = Enable distributed tracing and use the same Application Insights resource for all services [OK]
      Hint: Use distributed tracing with shared resource [OK]
      Common Mistakes:
      • Splitting telemetry into unlinked resources
      • Ignoring distributed tracing setup
      • Relying only on logs without correlation