Service Level Indicator data helps to understand how much Error Budget is left. TRUE or FALSE?

The Error Budget is a direct derivative of the Service Level Objective (SLO). It is calculated as 100% - SLO %. The Service Level Indicator (SLI) provides the real-time or historical measurement of the service's actual performance. By comparing the current SLI measurement against the SLO target over a specific window, an SRE team can determine how much of the error budget has been consumed or how much remains. For example, if the SLO is 99.9% and the SLI measures 99.95% performance, the team knows they are well within their budget.

This is a TRUE/FALSE question, so there are no other options to evaluate.

1. Beyer, B., Jones, C., Petoff, J., & Murphy, N. R. (2016). Site Reliability Engineering: How Google Runs Production Systems. O'Reilly Media. Chapter 3, "Embracing Risk," section "Error Budgets," explicitly states, "The error budget is the SLO subtracted from 100%... The current SLI measurement is compared with the SLO to see if the budget is 'in the black' or 'in the red'."

2. Adkins, J., et al. (2020). Building Secure and Reliable Systems. O'Reilly Media. Chapter 13, "Managing Risk," p. 211, defines the error budget as the "delta between the SLO and 100%," which is consumed when the SLI indicates service degradation.