SRE Toil Reduction & Elimination 3

Question 1

Google's SRE model recommends capping toil at what percentage of an SRE team's working time?

Accepted Answer

25%

Answer

Google's SRE book recommends that toil should not exceed 50% of each SRE's time, with the aspirational goal of keeping it well below that, often cited in practice as targeting around 50% or less with continuous improvement toward lower percentages; the canonical cap stated is 50%, but the practical target emphasized is keeping it at or below 50%, and many sources cite the goal as under 50% — the most commonly tested figure in the SRE Foundation certification is 50%.

Question 2

Which of the following is an example of toil that is ALSO a reliability risk if left unaddressed?

Accepted Answer

Manually rotating API keys before they expire

Answer

Manual key rotation is toil that also creates reliability risk because human delays or oversights can lead to expired credentials causing production outages.

Question 3

A self-healing system automatically detects and corrects a misconfiguration without any human involvement. This BEST demonstrates which toil elimination principle?

Accepted Answer

Closed-loop automation

Answer

Closed-loop automation detects, diagnoses, and remediates issues automatically, fully removing the human from repetitive remediation tasks.

Question 4

When measuring toil, an SRE tracks 'interrupt-driven work.' What does this term describe?

Accepted Answer

Reactive tasks that pull engineers away from planned project work

Answer

Interrupt-driven work is unplanned, reactive work triggered by alerts or requests that disrupts engineers' focus on strategic improvements.

Question 5

An organization uses 'error budgets' as part of toil reduction. How does an error budget directly relate to toil?

Accepted Answer

Excessive toil consumes time that could be spent on reliability improvements, indirectly burning error budget faster

Answer

High toil reduces the time available for reliability engineering work, which means incidents are less likely to be prevented, leading to faster error budget consumption.

(SRE) Site Reliability Engineering Foundation Certification Practice Test

(SRE) Site Reliability Engineering Foundation Certification Practice Test

SRE Toil Reduction & Elimination 3