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LOGICMONITOR BLOG

Outage Retrospective: What a Google Cloud Incident Revealed About Hidden Service Dependencies

See how a Google Cloud outage took major brands like Home Depot offline, and why digital experience monitoring spots failures before status pages update.

5–7 minutes
Denton Chikura

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The quick download:

When a shared cloud provider fails, your customers see the outage even when every system you own reports healthy.

  • The 2021 Google Cloud outage knocked Home Depot, Etsy, Spotify, and Priceline offline because they depended on Google Cloud behind the scenes.

  • LogicMonitor Digital Experience spotted the failure pattern across unrelated sites before Google’s public status page posted an incident.

  • Internal logs showed applications running normally while users hit Google 404 pages, proving the failure is from outside owned infrastructure.

  • Pair outside-in monitoring with your internal telemetry so you can catch downstream dependency failures the moment they hit customers.

Most of the digital services depend on infrastructure that businesses do not own or control. A cloud provider, DNS service, CDN, ISP, or third-party API can fail while an organization’s own systems continue reporting healthy status.

The Google Cloud outage of November 16, 2021, showed how quickly that dependency can affect customers. Websites operated by companies such as Home Depot, Etsy, Spotify, and Priceline displayed Google 404 pages because they relied on Google Cloud services behind the scenes.

The incident also showed why teams need visibility from outside their own infrastructure.LogicMonitor Digital Experience identified the wider pattern before Google’s public status page was updated.

The end-user view: a Google 404 where Home Depot should be

During the outage, a visitor attempting to reach Homedepot.com saw a Google 404 page instead of the retailer’s website.

Google 404 error page (Google)

Reloading the page and trying the URL with and without “www” produced the same result. The error suggested a problem with Google, even though the user was trying to reach Home Depot.

The issue became clearer when Catchpoint monitoring showed several unrelated websites failing with the same error. Each affected site relied on Google Cloud. Google’s status page had not yet published an incident notice, leaving customers and service teams to investigate the disruption without an official explanation.

A Google Cloud outage affected businesses far beyond Google

The incident began shortly after midday Eastern Time. Websites operated by companies that were not owned by Google went offline or returned Google 404 pages.

For those businesses, the consequences extended beyond a technical error. Failed transactions, abandoned sessions, support requests, and reputational damage can follow when customers cannot reach a service.

Google Cloud reported that several products were affected, including:

  • Google Cloud Networking
  • Google Cloud Functions
  • Google Cloud Run
  • Google App Engine
  • Google App Engine Flex
  • Apigee
  • Firebase

Google App Engine traffic fell by 80% across central areas of the United States and portions of Western Europe. Google Cloud Networking customers could not make changes to website load balancing, which contributed to the 404 responses.

Synthetic tests revealed the shared failure pattern

Monitoring detected a sharp increase in failed tests at 12:39 p.m. Eastern Time. The failures affected companies of different sizes, including Nest, 1-800-Flowers, CNET, Home Depot, Etsy, Priceline, Spotify, and Google.

Sudden burst of failed tests, November 16, 2021

By approximately 1:10 p.m., some services had recovered. According to Google’s incident report, the issue was not fully resolved across all affected products until 2:28 p.m. Eastern Time. Recovery varied by service and location, with some businesses continuing to see errors or slow page loads after other services had returned.

Google attributed the incident to “a latent bug in a network configuration service which was triggered during routine system operation.” The company stated that two safeguards had been added to reduce the risk of a recurrence. The incident report also documented the wider effect on customers that depended on Google Cloud infrastructure.

Three lessons for SRE and DevOps teams

This outage offers three practical lessons for teams responsible for digital services.

Lesson 1: Give customers a branded error page

A generic provider error page can confuse customers. Someone trying to reach a retailer, bank, or SaaS application expects information from that business, not from the cloud provider behind it.

Teams should prepare a branded fallback page that explains the disruption and provides a clear next step. They should also maintain a tested process for changing DNS or CDN configuration when the primary service becomes unreachable.

A status page and social media updates still have value, but they should supplement the experience shown to customers who encounter the failure directly.

Lesson 2: Monitor services from outside your cloud environment

Internal logs and application traces may show that an application is functioning normally while users cannot reach it. That is what makes third-party infrastructure outages difficult to diagnose: the failure may occur beyond the systems an organization operates.

Outside-in monitoring checks the service from the perspective of users across different locations, networks, ISPs, and cloud environments. It can help teams determine whether the problem involves:

  • DNS resolution
  • CDN behavior
  • BGP routing
  • Cloud connectivity
  • ISP or last-mile access
  • Third-party APIs
  • Application availability

Synthetics validates whether pages load and critical workflows complete. Real User Monitoring (RUM) shows what actual visitors experience. Internet Sonar adds broader Internet-health context, helping responders assess whether a disruption extends beyond their own service.

Internet Performance Monitoring supports this investigation with visibility into Internet paths and third-party services. Within the broader Digital Experience story, it helps explain delivery conditions; Synthetics and RUM show how those conditions affect users.

Together, these perspectives help teams distinguish an application failure from a reachability or provider problem outside the application.

Lesson 3: Track service-level objectives and MTTR

Teams need independent timing data to understand when an incident began, how different locations were affected, and when service returned.

Tracking SLAs, SLIs, and SLOs provides a consistent way to measure service performance and provider commitments. It also gives incident responders evidence to compare with provider status updates.

Status pages may not reflect every customer’s experience. Independent monitoring can show when tests first encountered failures and whether recovery occurred evenly across regions. RUM adds evidence of the experience actual visitors received during that period.

Keep detection, provider recovery, and verified customer recovery distinct. A provider’s resolution notice is an important milestone, but teams still need to confirm that their own critical journeys are working.

Connect digital experience with internal infrastructure health

The Google Cloud outage was a reminder that customer experience depends on a chain of services. A business may operate its applications and databases, yet still depend on cloud networking, DNS, CDN delivery, Internet routing, and third-party providers.

That chain crosses organizational boundaries. Internal infrastructure monitoring covers the systems a team operates. Outside-in monitoring shows whether users can reach and use the service through the wider Internet.

LogicMonitor Digital Experience is the experience and Internet-context layer of LogicMonitor’s AI-first platform for Autonomous IT. It combines Real User Monitoring, Synthetics, Endpoint Monitoring, Internet Sonar, and Internet Performance Monitoring to connect user experience with the systems and services behind it.

For an incident like this one, Synthetics can identify failing journeys, RUM can establish actual user impact, and Internet Sonar can supply context about a broader disruption. Teams can compare those findings with internal infrastructure health to determine whether to investigate their own environment or escalate to an external provider.

Edwin AI connects experience and Internet-context signals with infrastructure and application telemetry to help teams identify probable cause, determine responsibility, and take guided, governed action.

Identify shared dependency failures and focus the response

When several services fail together, teams need to know what connects them. Correlate customer-facing failures with internal health and provider context so responders can identify the affected dependency, route the incident, and verify recovery.

See downstream failures before your customers do.

LogicMonitor connects user experience with infrastructure health and Internet conditions, helping teams identify shared dependency failures, route incidents to the right owner, and verify recovery.

FAQs

Why did non-Google websites like Home Depot show a Google 404 page during the outage?

Those companies relied on Google Cloud services such as networking and load balancing behind the scenes. When Google Cloud Networking customers could not update load balancing configurations, requests returned Google 404 pages instead of the intended sites. The failure originated in a shared upstream dependency that many businesses relied on at once.

How can teams detect a cloud provider outage when their own systems look healthy?

Internal logs and traces often show an application running normally even when users cannot reach it. Outside-in monitoring tests the service from real user locations, networks, and ISPs, revealing DNS, CDN, BGP, or cloud connectivity failures that internal tools miss. Synthetic monitoring flagged this outage across unrelated sites before Google’s status page posted an incident.

What should teams do to reduce the impact of a third-party outage?

Prepare a branded fallback page and a tested process for changing DNS or CDN configuration when a primary service goes down. Monitor services from outside your cloud environment, and track SLAs, SLIs, and SLOs so you have independent timing data on when an incident started and recovered. Together these steps shorten diagnosis time and protect the customer experience.

By Denton Chikura

Content Marketing Manager

Denton Chikura is a Content Marketing Manager for LogicMonitor Digital Experience, where he drives content on observability, Internet performance, and digital experience. He writes for SREs, IT operations teams, and business leaders, turning performance data into guidance they can act on.

Disclaimer: The views expressed on this blog are those of the author and do not necessarily reflect the views of LogicMonitor or its affiliates.

© LogicMonitor 2026 | All rights reserved. | All trademarks, trade names, service marks, and logos referenced herein belong to their respective companies.

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