Application Insights for apps in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

How does Application Insights collect telemetry data?

Application Insights gathers data from your app to monitor its performance and usage. Which method below correctly describes how it collects telemetry?

A By scanning the app's source code for errors without running it.

B By manually exporting logs from the app and uploading them to Azure.

C By embedding a monitoring SDK in the app that sends telemetry data to Azure.

D By using Azure Storage to store app files and analyzing them offline.

💡 Hint

Think about how real-time monitoring tools work inside an app.

Application Insights uses an SDK embedded in your app to send telemetry data automatically to Azure for monitoring.

❓ Architecture

intermediate

Which Azure resource is required to enable Application Insights for a web app?

You want to monitor your Azure Web App using Application Insights. Which resource must you create or link to enable this?

A An Azure Virtual Machine to run the monitoring agent.

B An Azure SQL Database to log application errors.

C An Azure Storage account to store telemetry data.

D An Application Insights resource in the same Azure subscription.

💡 Hint

Consider what resource directly supports Application Insights data collection.

Application Insights requires a dedicated resource in Azure to receive and analyze telemetry data from your app.

❓ security

advanced

What is the best practice to secure Application Insights instrumentation key in your app?

To protect your Application Insights data, how should you handle the instrumentation key in your application?

A Hardcode the instrumentation key directly in the app's source code for easy access.

B Store the instrumentation key in environment variables or secure configuration stores, not in source code.

C Share the instrumentation key publicly to allow all team members to monitor the app.

D Embed the instrumentation key in client-side JavaScript to track user behavior.

💡 Hint

Think about how to keep sensitive keys safe from unauthorized access.

Storing keys in environment variables or secure stores prevents accidental exposure and improves security.

❓ Configuration

advanced

What happens if you disable sampling in Application Insights for a high-traffic app?

Sampling reduces the amount of telemetry sent to Application Insights. What is the effect of disabling sampling on a busy app?

A Telemetry volume increases, possibly causing higher costs and slower processing.

B Telemetry volume decreases, improving performance and reducing costs.

C The app stops sending any telemetry data to Application Insights.

D Application Insights automatically filters out errors but keeps all traces.

💡 Hint

Consider what happens when all telemetry is sent without filtering.

Disabling sampling means all telemetry is sent, increasing data volume, costs, and processing time.

🧠 Conceptual

expert

Which query correctly returns the count of failed requests in Application Insights logs?

You want to find how many requests failed in your app using Application Insights Analytics. Which Kusto query returns the count of failed requests?

Azure

requests | where success == false | summarize count()

A requests | where success == false | summarize count()

B requests | where success = false | summarize count()

C requests | filter success == false | count()

D requests | where success == false | count

💡 Hint

Remember the correct syntax for filtering and counting in Kusto Query Language.

The correct syntax uses 'where' to filter and 'summarize count()' to count rows.