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Site Reliability Engineering is the next step in the DevOps practice. It ensures that the target application remains available, performant, and optimally utilized. Service Level Agreements (SLA) and Service Level Indicators (SLI) are the targets that need to be met to fulfill the SLAs. SRE teams need to work through the SLA and SLOs with the help of SLIs to keep the solution well within the Error Budget. That is the only way to improve the reliability of a system.