You may see a build failure on the pipelines page that you didn't set up. If the pipeline is named flaky-agent-task like the picture below, then this is configured by Chunk.

You can check the pipeline configuration on the Project Settings - Project Setup page. This pipeline is triggered at 10:00 PM, Sunday through Thursday, in UTC by default.

Please confirm whether you're an admin of the project. The pipeline can be edited or deleted only by an admin user.