The UI is not loading in Prod-3 after the deployment.

Incident Report for Harness

Postmortem

After deployment on the prod-3 cluster, NextGenUI got stuck on the initial loading screen. The issue was observed immediately during post-deployment sanity.

We identified the problem to be with our required static resources failing to load. This release included a change to how we build and load the UI for different environments. The change involved making the source for static-files configurable per-environment. But an incompatible configuration for the prod-3 cluster prevented the correct URL from being formed, resulting in 404 for our JS resources.

We mitigated the incident by updating the service configuration for this environment and re-deploying the Nextgen UI service. With the new configuration, the UI service was able to generate the correct URLs, and the issue was resolved.

Timeline

Time (UTC)	Event
12:44 AM	Incident was first detected after the new deployment. An internal incident was raised, and the team started looking into the issue.
12:46 AM	Root cause identified and the fix was deployed.
12:47 AM	Incident resolved

Action Items

We are auditing the service configurations for all environments with an aim to minimize the differences.
Improve the Nextgen UI build process to handle incompatible configurations.

Posted Jan 31, 2024 - 13:00 PST

Resolved

The incident has been resolved. We will provide a postmortem once we have gathered all the details.

Posted Jan 29, 2024 - 16:56 PST

Monitoring

A fix has been implemented and we are monitoring the results.

Posted Jan 29, 2024 - 16:47 PST

Investigating

We are currently investigating this issue.

Posted Jan 29, 2024 - 16:44 PST

This incident affected: Prod 3 (Continuous Delivery (CD) - FirstGen - EOS, Continuous Delivery - Next Generation (CDNG), Cloud Cost Management (CCM), Continuous Error Tracking (CET), Continuous Integration Enterprise(CIE) - Cloud Builds, Continuous Integration Enterprise(CIE) - Self Hosted Runners, Custom Dashboards, Feature Flags (FF), Security Testing Orchestration (STO), Service Reliability Management (SRM), Chaos Engineering).