What would be considered as Key Performance Indicators (KPIS) that a Project Manager would use to predict the ability to keep a project within budget?

Question: Project Managers use current project performance as an indicator of future performance. Considering this, what would be considered as Key Performance Indicators (KPIS) that a Project Manager would use to predict the ability to keep a project within budget?
Post Requirements: Your post should elaborate on the topic provided, and should be about 2 solid paragraphs.

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