A team has overridden the 'EntityPage' component in the Catalog plugin to add a custom tab. After a recent Backstage upgrade, the custom tab no longer appears. The upgrade notes mention changes to the Catalog plugin's extension points. What is the most likely cause and the best solution?

The upgrade removed the custom tab because it was not registered in the app's configuration; add it to app-config.yaml.

The override was lost during the upgrade because it was done in node_modules; reapply the override.

The upgrade introduced a bug in the Catalog plugin; revert to the previous version.

The extension point API changed in the upgrade, so the override is no longer compatible; update the override to use the new API.

Why is testing important for customized Backstage plugins?

To remove the need for documentation

To increase the plugin's bundle size

To ensure customizations work correctly and do not break existing functionality

A team wants to customize the TechDocs plugin to show a 'Last Updated' badge on each documentation page. They have identified that the plugin exposes a component for the page header. What is the best approach to add this badge?

Override the page header component with a custom implementation that includes the badge.

Create a separate plugin that renders the badge and place it above the TechDocs page.

Use the TechDocs API to inject the badge into the rendered HTML.

Modify the TechDocs plugin's CSS to add the badge via pseudo-elements.

An organization uses the PagerDuty plugin to display on-call schedules. They want to change the plugin's default polling interval from 5 minutes to 1 minute. What is the most appropriate way to achieve this?

Modify the plugin's source code to change the polling interval constant.

Use the PagerDuty API to change the polling interval on their servers.

Create a custom wrapper plugin that overrides the polling logic.

Set the polling interval in the app-config.yaml under the pagerduty section.

A developer is building a custom page that needs to display data from the Cost Insights plugin. They want to fetch cost data for a specific team. What is the recommended way to access this data?

Import the Cost Insights plugin's API client and call its methods directly.

Use the Backstage catalog API to retrieve cost data.

Make a direct HTTP request to the Cost Insights backend endpoint.

Duplicate the Cost Insights plugin's data fetching logic in your custom page.

Certified Backstage Associate (CBA)

Domain 4Objective 2

Customizing Backstage Plugins CBA Practice Questions (Page 6)

Part of the Customizing Backstage domain, which accounts for 32% of the CBA exam. Linux Foundation does not publish an official question count, but from its 90-minute exam (~35–60 total, ~11–19 in this domain), expect 3–5 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

7free pages

8concepts

32%of the exam

Questions 26–30

26expert · hard
A team has overridden the 'EntityPage' component in the Catalog plugin to add a custom tab. After a recent Backstage upgrade, the custom tab no longer appears. The upgrade notes mention changes to the Catalog plugin's extension points. What is the most likely cause and the best solution?
Select an answer first
27foundation · easy
Why is testing important for customized Backstage plugins?
Select an answer first
28application · medium
A team wants to customize the TechDocs plugin to show a 'Last Updated' badge on each documentation page. They have identified that the plugin exposes a component for the page header. What is the best approach to add this badge?
Select an answer first
29application · medium
An organization uses the PagerDuty plugin to display on-call schedules. They want to change the plugin's default polling interval from 5 minutes to 1 minute. What is the most appropriate way to achieve this?
Select an answer first
30application · medium
A developer is building a custom page that needs to display data from the Cost Insights plugin. They want to fetch cost data for a specific team. What is the recommended way to access this data?
Select an answer first

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