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Building and testing applications →hardMultiple ChoiceObjective-mapped

Cloud Build Triggers for Monorepo Selectively Build Changed Services — Filepath Filters

This PCD practice question tests your understanding of building and testing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A company has a monorepo with multiple services. They want to only build and test the services that have changed in a given commit. Which Cloud Build feature should they use?

Quick Answer

The answer is Cloud Build triggers with filepath filters. This feature allows you to define included files and ignored files patterns so that a trigger only fires when a commit modifies code within specific directories, making it the ideal solution for selectively building changed services in a monorepo. On the Google Professional Cloud Developer exam, this question tests your understanding of how to optimize CI/CD pipelines for monorepo architectures without triggering unnecessary builds across all services. A common trap is confusing filepath filters with branch filters, which only scope triggers to specific Git branches rather than file paths. Remember the memory tip: "Branch filters control *when* you build; filepath filters control *what* you build."

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Build triggers with filepath filters

Cloud Build triggers with filepath filters allow you to specify glob patterns that match changed files in a commit. When a commit includes changes only to files matching the filter, the trigger runs; otherwise, it is skipped. This enables selective building and testing of only the services that have changed in a monorepo, avoiding unnecessary builds for unaffected services.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    Build triggers with filepath filters

    Why this is correct

    Filepath filters (included_files/ignored_files) limit the trigger to specific paths, enabling per-service builds.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Use a custom builder image

    Why it's wrong here

    Custom builders don't provide per-path filtering; the trigger configuration does.

  • ✗

    Build triggers with branch filters

    Why it's wrong here

    Branch filters only filter by branch name, not by which files changed.

  • ✗

    Use Cloud Build substitutions

    Why it's wrong here

    Substitutions are variables that allow parameterization, they do not filter which builds run.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google often tests the distinction between filepath filters (which conditionally trigger builds based on changed files) and branch filters (which trigger builds based on branch names), leading candidates to mistakenly choose branch filters when the requirement is to build only changed services.

Detailed technical explanation

How to think about this question

Filepath filters in Cloud Build triggers use glob patterns (e.g., `services/service-a/**`) evaluated against the list of changed files in the commit. Under the hood, Cloud Build compares the file paths in the commit diff against the include/exclude patterns; if no pattern matches, the trigger is not invoked. This is especially useful in large monorepos where a single commit may touch multiple services, and you want to run only the relevant build and test pipelines to save time and resources.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCD question test?

Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Build triggers with filepath filters — Cloud Build triggers with filepath filters allow you to specify glob patterns that match changed files in a commit. When a commit includes changes only to files matching the filter, the trigger runs; otherwise, it is skipped. This enables selective building and testing of only the services that have changed in a monorepo, avoiding unnecessary builds for unaffected services.

What should I do if I get this PCD question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.