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Today’s speakers
Thomas Voß
Staff SRE@Google

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Measuring
Reliability in
Production
Step By Step SLO
Creation in Cloud
Operations
stackconf ‘23, 2023-09-13

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The Most Important
Feature of Any System is
its Reliability

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SRE is what you get
when you treat
operations as a
software problem.

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What is the Level of reliability we
need?

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Terminology
CUJ SLIs SLOs SLAs
User interacts with
Service to achieve Goal
Critical User Journeys:
Your most important
user journeys
Metrics that describe
users' experiences
Targets for the overall
health of a service
Contractual obligations

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Alignment throughout the Product Life Cycle
Concept Business Development Operations Market
Alignment
through SLOs
Business Process

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Creating SLI/O
Step By Step

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Cloud Operations Sandbox
Click-to-deploy open sourced learning experience that helps practitioners gain an
understanding of how to use Cloud Operations tools and apply SRE practices in an
isolated cloud environment with synthetic traffic, that is similar to real production.
● A “playground environment” to evaluate Cloud Operations as close as possible to
real production
● Includes: Demo Service, One-click deployment script, Interactive walkthrough ,
Synthetic Load Generator, SRE Recipes, etc.
● Start here:
github.com/GoogleCloudPlatform/cloud-ops-sandbox/

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Online Boutique
*github.com/GoogleCloudPlatform/microservices-demo#architecture

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*github.com/GoogleCloudPlatform/microservices-demo#architecture
Online Boutique

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1. SLO Process -CUJ
List out critical user journeys and order them by business impact:
Browse products, Check out, Add to cart

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1. SLO Process -CUJ
List out critical user journeys and order them by business impact:
1. Check out
2. Add to cart
3. Browse products

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As a shopper I want to see
purchase (checkout) items in the
store.
Critical User Journeys

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SLO Process - SLI Creation
Determine which metrics to use as service-level indicators (SLIs) to most accurately track
the user experience.

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SLO Process -SLI creation
1. SLI Type:
○ Request/response interaction in a user journey, measure: availability, latency, and quality.
○ Data processing: freshness, coverage, correctness and throughput.
○ Storage: throughput and latency.
2. SLI Specification: an assessment of service outcome that you think matters to users
○ For availability: The proportion of valid events served successfully
○ For latency: The proportion of valid events served faster than a threshold
3. SLI Implementation: a way to measure the SLI specification
○ Includes: event + success criteria + where/how you record the SLI.
○ Measurement Strategies: Application-level Metrics, Logs Processing, Front-end Infra Metrics, Synthetic
Clients/Data, Client-side Instrumentation

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SLO Process -Availability SLI creation
SLI Type: availability
SLI Specification: The proportion of valid checkout events served successfully.
● Requests to the CheckoutService that return HTTP response code 2xx, 3xx, or 4xx (excl. 429)
SLI Implementation: The proportion of HTTP GET requests for /checkout_service/response_counts
that do not have 5XX status (3XX and 4XX excluded) measured at the Istio service mesh.

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SLO Process - SLO
1. Determine SLO target goals
2. Determine SLO measurement period
SLO should include: target and a measurement window:
● 99.9% of Checkout requests in the past 28 days are successful

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SLO Process
1. List out critical user journeys and order them by business impact.
2. Determine which metrics to use as service-level indicators (SLIs) to most
accurately track the user experience.
3. Determine SLO target goals and the SLO measurement period.
4. Configure SLI, SLO, and error budget consoles.
5. Configure SLO alerts.

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Measuring Reliability
on GCP

22. Setup Guide in 4 easy steps
Define Service Define SLI Define SLO Define Alert
Select or define a service to
monitor
Identify a behaviour for
your service to observe
Set a target for the service in
a time window
Configure alerts on the
service health & burn rate

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Demo

30. Services Overview
Service Definition
1
2
SLI Creation
3
SLO Creation
4
SLO Alerts Creation
5

31. SLI Creation
SLO Creation
SLO Alerts
Services Overview
Service Definition
1
2
3
4
5

32. SLI Creation
SLO Creation
SLO Alerts
Services Overview
Service Definition
1
2
3
4
5

33. SLI Creation
SLO Creation
SLO Alerts
Services Overview
Service Definition
1
2
3
4
5

34. SLI Creation
SLO Creation
SLO Alerts
Services Overview
Service Definition
1
2
3
4
5

35. SLI Creation
SLO Creation
SLO Alerts
Services Overview
Service Definition
1
2
3
4
5

36. Setup Guide in 4 easy steps
Define Service Define SLI Define SLO Define Alert
Select or define a service to
monitor
Identify a behaviour for
your service to observe
Set a target for the service in
a time window
Configure alerts on the
service health & burn rate

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How can you get started?

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Resources
● Cloud Operations Sandbox one click Cluster:
github.com/GoogleCloudPlatform/cloud-ops-sandbox/
● Collection of public resources bit.ly/Public_SRE_Resources
● Detailed step by step guide: Measuring Reliability in GCP: Step By Step SLO creation guide using
Cloud Operation Sandbox.
● [Qwiklabs] Cloud operations for GKE
●

39. *Cover images used with permission. These books can be found on shop.oreilly.com.
Google's
Public
Resources
● Coursera for leaders Developing a Google SRE Culture , for engineers Site
Reliability Engineering: Measuring and Managing Reliability,
● Art of SLOs classroom: The Art Of SLOs
● Blogs: DevOps & SRE
● Google Professional Services SRE packages
● The books

40. Follow us on Twitter: @googlesre. Find Google SRE publications—including the SRE
Books, articles, trainings, and more—for free at sre.google/resources.
Book covers copyright O’Reilly Media. Used with permission.

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Q&A?

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Thank you!