DevOps-SRE Dumps With Exact Questions and Answers

Comprehensive and Detailed Explanation From Exact Extract:

A Service Level Indicator (SLI) is a measurement of some aspect of reliability (e.g., latency, availability, quality). One of its defining characteristics is that it must be measured over a specific time window. Without a time horizon, the SLI has no actionable meaning.

From the Site Reliability Engineering Book, Chapter “Service Level Indicators”:

“An SLI is a quantitative measure of some aspect of the level of service that is provided. SLIs are evaluated over a specific period of time in order to understand reliability as experienced by the user.”

The SRE Workbook further states:

“Every SLI must define a measurement window. Without a time horizon, the indicator cannot be used to calculate SLO compliance.”

Why the other options are incorrect:

A SLIs do not need to appear in an SLA; SLAs are external contracts, SLOs/SLIs are internal engineering tools.

B SLIs may include client-side, server-side, or network metrics depending on what reflects user experience.

D SLI agreement is not defined by SRE vs. Agile teams; it is defined by business and user need.

Thus, the correct answer is C.

Comprehensive and Detailed Explanation From Exact Extract:

The term observability comes directly from control theory and refers to the ability to infer the internal state of a system from its external outputs. Modern SRE and observability practices adopt this definition.

Google’s Site Reliability Engineering guidance (SRE Book Addendum on Observability) states:

“Observability is a property of a system that allows operators to understand its internal state by examining its outputs such as logs, metrics, and traces.”

This aligns exactly with Option C, the formal definition.

Why the other options are incorrect:

A Monitoring is part of observability, but observability is much broader.

B Health checks are simply one signal; they do not represent observability.

D Data collection is a mechanism, not the definition of observability itself.

Thus, C is the correct and academically accurate definition.

Comprehensive and Detailed Explanation From Exact Extract:

SRE applies economic principles, including diminishing marginal returns, to reliability engineering. As per the SRE Book: “Improving reliability becomes more expensive as the target approaches 100%, moving from increasing returns, to diminishing returns, and eventually negative returns.” (SRE Book – SLO Economics). This framework helps explain why striving for 100% availability is impractical and cost-ineffective.

The three recognized stages are:

Increasing returns – early improvements are inexpensive and highly impactful

Diminishing returns – costs rise while benefits shrink

Negative returns – achieving additional “nines” may reduce value due to slowed innovation

“Possible returns” is not part of this model.

Thus, D is the correct answer.