Cost monitoring and budgets in Firebase - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Firebase Budget Alerts

Which Firebase feature allows you to receive notifications when your project spending approaches or exceeds a set budget?

A Firebase Budget Alerts

B Firebase Performance Monitoring

C Firebase Crashlytics

D Firebase Remote Config

💡 Hint

Think about tools that help track and notify about costs.

Firebase Budget Alerts notify you when your spending nears or exceeds your set budget, helping you control costs.

💻 Command Output

intermediate

Firebase CLI Budget Notification Command Output

What is the expected output when running the Firebase CLI command to list all budget alerts for a project?

Firebase

firebase billing:budgets:list --project=my-firebase-project

A No budgets found for project my-firebase-project

B [{"name":"budget1","amount":100,"thresholdRules":[{"percent":0.5},{"percent":0.9}]}]

C Error: Command not found

D [{"budgetName":"budget1","limit":100}]

💡 Hint

Verify if this command exists in the Firebase CLI.

The Firebase CLI does not have a 'billing:budgets:list' command. Budgets are managed through the Google Cloud Console or 'gcloud alpha billing budgets list' command.

❓ Configuration

advanced

Setting a Budget Alert Threshold in Firebase

Which JSON snippet correctly sets a budget alert threshold at 80% of a $200 budget in Firebase billing API?

A {"budgetAmount":200,"thresholdRules":[{"percent":0.8}]}

B {"amount":200,"thresholdRules":[{"percent":80}]}

C {"budget":200,"thresholds":[{"percent":0.8}]}

D {"budgetAmount":200,"thresholdRules":[{"thresholdPercent":0.8}]}

💡 Hint

Check the exact key names used in Firebase billing API for budget and threshold.

The correct keys are 'budgetAmount' and 'thresholdRules' with 'thresholdPercent' for threshold percentage as a decimal (0.8 = 80%).

❓ Troubleshoot

advanced

Troubleshooting Missing Budget Alerts in Firebase Console

You created a budget alert in Firebase but do not see any notifications when spending exceeds the budget. What is the most likely cause?

A Billing account is not linked to the Firebase project

B Budget alert email notifications are disabled in Firebase settings

C Firebase project is in test mode

D Budget alert thresholds are set above 100%

💡 Hint

Check if billing is properly connected to the project.

If the billing account is not linked, budget alerts cannot track spending and will not send notifications.

🔀 Workflow

expert

Automating Cost Monitoring with Firebase and Cloud Functions

Which workflow correctly describes how to automate sending a custom Slack notification when Firebase billing exceeds 90% of a budget?

A Create a Firebase Realtime Database trigger > Monitor billing data changes > Send Slack message directly from database trigger

B Create a budget alert in Firebase > Configure Pub/Sub topic for alerts > Deploy Cloud Function triggered by Pub/Sub > Cloud Function sends Slack message

C Use Firebase Hosting to serve a webhook > Poll billing API every minute > Send Slack message if threshold exceeded

D Set up Firebase Authentication > Use user login events to trigger billing checks > Send Slack message if over budget

💡 Hint

Think about how Firebase budget alerts integrate with Google Cloud Pub/Sub and Cloud Functions.

Budget alerts publish messages to Pub/Sub; Cloud Functions can subscribe to these and send Slack notifications automatically.