Each build config creates three configmaps <NAME>-ca, <NAME>-global-ca, and <NAME>-sys-config which generally stays in the namespace even after build completes. 

Due to old configmaps in the namespace, resource quota prevents creating new configmaps and end up failing the build.

Each time user needs to delete the old configmaps and then build gets succeeded.

Every build config creates the configmaps by default

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2.
3.

Old configmaps stays in the namespace.

Clean the old configmaps once build process completes.