12. @HannahFoxwell#PivotalParis
“SRE is what happens when a software
engineer is tasked with what used to
be called operations”
Ben Treynor – Founder of Google’s SRE Team
19. @HannahFoxwell#PivotalParis
100%
# of 9’s
0%
Cost of effort
à Exponentially increases
Likelihood anybody notices
à Customer experience
Likelihood anybody cares
à Customer expectation
The Economics of Reliability
99.99%
Error Budget = 4.03 minutes
20. @HannahFoxwell#PivotalParis
100% Availability is not
your target.
So what is?
Agree your SLI’s and
SLO’s with everyone.
Yes, everyone.
Oops! We broke
something.
What now?
SLO Error Budget
(per 28 Days)
99% 403 mins
99.5% 202 mins
99.9% 40.3 mins
99.95% 20.2 mins
99.99% 4.03 mins
99.999% 0.40 mins
• Everyone understands
the importance of
reliability
• Everyone understands
the error budget and
how it works
• Everyone understands
the new rules!
• On-call / Playbooks / Fire
drills
• Blameless Incident
Review / Retrospective
• Review error budget
• Reduce risk and invest in
reliability
30. @HannahFoxwell#PivotalParis
“Psychological safety is a belief that one
will not be punished or humiliated for
speaking up with ideas, questions,
concerns, or mistakes.”
Amy Edmondson– Harvard Business School Professor
31. @HannahFoxwell#PivotalParis
Research
Psychological safety
was studied in a
medical environment
• Teams were measured on Psychological Safety,
Error Rates and Team Performance
• Higher Psychological Safety correlated to higher
Error Rates
• However, higher Error Rates correlated to
higher Team Performance
• Better practices. More lives saved.
Amy Edmondson– Learning from mistakes is easier said than done
33. @HannahFoxwell#PivotalParis
Failure is Normal
Psychological Safety
Hannah’s
Hypothesis
SRE Practices can
transform teams by
improving their
Psychological
Safety
SRE Practices
Increase learning from
mistakes
Boosts employee
engagement
Improved innovation
39. @HannahFoxwell#PivotalParis
“If we have to staff humans to do the work,
we are feeding the machines with the blood,
sweat and tears of human beings”
Joseph Bironas – Google SRE
Chapter 7: The Evolution of Automation at Google