Cloud Trace for latency analysis in GCP - Commands & Configuration

Introduction

When your app feels slow, you want to find out which part takes the most time. Cloud Trace helps you see how long each step in your app takes, so you can fix delays and make it faster.

When you want to see how long your app takes to respond to user requests.

When you need to find slow parts in your app that cause delays.

When you want to monitor app performance over time to catch issues early.

When you want to understand how different services in your app work together and where time is spent.

When you want to improve user experience by reducing wait times.

Commands

This command turns on the Cloud Trace service for your Google Cloud project so you can start collecting latency data.

Terminal

gcloud services enable cloudtrace.googleapis.com

Expected Output

Operation "operations/enableCloudTrace" finished successfully.

Check the current permissions to ensure your app or user has rights to write trace data.

Terminal

gcloud projects get-iam-policy example-project

Expected Output

bindings:

- members:

  - serviceAccount:[e-mail]

  role: roles/cloudtrace.agent

etag: BwW1x7z9v7k=

View the latest 5 trace spans collected to see latency data and understand app performance.

Terminal

gcloud trace spans list --project=example-project --limit=5

Expected Output

TRACE_ID                             SPAN_ID    NAME               START_TIME                 END_TIME

1234567890abcdef1234567890abcdef   1          /api/request       2024-06-01T12:00:00Z      2024-06-01T12:00:01Z

abcdef1234567890abcdef1234567890   2          /db/query          2024-06-01T12:00:00Z      2024-06-01T12:00:00.500Z

→

--limit - Limits the number of trace spans shown

→

--project - Specifies which Google Cloud project to use

Key Concept

If you remember nothing else from this pattern, remember: Cloud Trace shows you exactly where your app spends time so you can fix slow parts.

Common Mistakes

Not enabling the Cloud Trace API before trying to collect data.

Without enabling the API, no latency data is collected or shown.

Always run 'gcloud services enable cloudtrace.googleapis.com' first.

Not assigning the correct IAM role to the service account sending trace data.

Without the 'roles/cloudtrace.agent' role, your app cannot send trace data.

Grant the 'roles/cloudtrace.agent' role to your app's service account.

Trying to view trace data before any requests have been made to the app.

No trace data exists until your app handles requests and sends traces.

Generate some traffic to your app first, then check trace spans.

Summary

Enable Cloud Trace API to start collecting latency data.

Check and assign correct permissions for trace data sending.

Use gcloud commands to view recent trace spans and analyze app latency.