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The Four Key DevOps metrics are: Lead Time for Change, Deploy Frequency, Change Failure Rate and Median Time to Restore. SourceLevel CEO George Guimarães explains why we measure it slightly differently at Source Level. He says the metrics are essential for engineering teams seeking effectiveness and efficiency. The metrics give a perfect overview of how the system responds to daily activities and reflect on the development pipeline, and any change in the process reflects on them. It's crucial to measure up to production because staging or any other non-official environment won’t provide any value.