Are Your SLOs Lying To You? A Guide to Achieving True Service Reliability

Achieving a high Service Level Objective (SLO) for uptime, such as 99.95%, might create an illusion of reliability that masks underlying issues affecting specific user groups or regions. To address this, a two-pronged strategy is recommended: first, isolating the signal from noise by separating planned maintenance from unplanned incidents to prevent skewed error budgets and alert fatigue; second, deconstructing a global SLO into meaningful segments by faceting based on infrastructure, customer tier, and technology attributes. By doing so, teams can gain a detailed understanding of the service's performance, allowing them to proactively identify and resolve issues, focus engineering efforts where needed, and set targeted alerts for critical segments. This mature approach to service reliability management ensures that dashboard indicators accurately reflect the system's performance for all users, rather than being a misleading, singularly positive metric.