Reliability @Scale 2022

Virtual 10:00am - 3:15pm

Event Completed

Reliability @Scale is a technical conference for engineers who are passionate about building and understanding highly resilient and reliable systems at massive scale. Whether it’s novel design decisions, or outages that impact billions of people, providing reliable experiences for Systems at this scale present unique technical challenges. The @Scale community focuses on bringing people together to discuss these challenges and collaborate on the development of new solutions.

Reliability @Scale will be hosted virtually. Joining us are speakers from Akamai, Cloudflare, Fastly, Google, Meta, and Roblox. The event will be hosted on August 31, 2022 with talks themed around large-scale outages, incident response and learnings, and measuring reliability at scale.

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Our Pledge
In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to make participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, religion, or sexual identity and orientation.

Our Standards
Examples of behavior that contributes to creating a positive environment include:

  • Using welcoming and inclusive language
  • Being respectful of differing viewpoints and experiences
  • Gracefully accepting constructive criticism
  • Focusing on what is best for the community
  • Showing empathy towards other community members

Examples of unacceptable behavior by participants include:

  • The use of sexualized language or imagery and unwelcome sexual attention or advances
  • Trolling, insulting/derogatory comments, and personal or political attacks
  • Public or private harassment
  • Publishing others’ private information, such as a physical or electronic address, without explicit permission
  • Other conduct which could reasonably be considered inappropriate in a professional setting

Our Responsibilities
Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.

Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.

This Code of Conduct applies within all project spaces, and it also applies when an individual is representing the project or its community in public spaces. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.

This Code of Conduct also applies outside the project spaces when there is a reasonable belief that an individual's behavior may have a negative impact on the project or its community.

Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.

Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project’s leadership.

This Code of Conduct is adapted from the Contributor Covenant, version 1.4, available at

For answers to common questions about this code of conduct, see

Event Completed
10:00am - 10:15am

How We Drained Every Backbone Router Simultaneously

Presented by: Santosh Janardhan (Meta)
10:15am - 10:40am

Lessons Learned from the Halloween Outage

In this talk, VP of Engineering Max Ross will discuss the 73 hour outage that impacted Roblox late last year. He will also share some of the ways that a multi-day outage can turn conventional reliability wisdom on its head.
10:40am - 10:55am

QUIC Exit: Exposing a New Class of Outage

A crash bug in QUIC handshake code exposed a new class of bugs we termed ‘contagion bugs’. For these bugs, a tiny number of tasks can cause a huge outage and rollbacks don’t work as expected. This talk details what contagion bugs are, discusses the details of the outage, and what we did to prevent and mitigate them going forward.
10:55am - 11:10am

Service Incident Deep Dive: Technical Overview & Learnings

This talk will provide a technical overview of a service incident on the Akamai platform in July 2021 which, despite layers of safety technologies, nevertheless impacted some of Akamai’s customers. In addition to exploring the technical underpinnings of the incident, there will be discussion of lessons learned and actions taken to broadly reduce the risk of recurrence.
11:10am - 11:25am

Lessons From Long-Running Investigations

In this talk, we share some lessons from several of our long-running investigations. Some of them are well-known, but are worth repeating, and some of them are things we learned and want to share.
11:25am - 11:45am

AWS Infrastructure: Engineering for Resiliency at Scale

Presented by: Prasad Kalyanaraman (AWS)
11:45am - 12:00pm

Pipefail Overview and Discussion

On December 16, 2021, an unlikely series of distributed system events slowed down customer requests through the Cloudflare system for a period of approximately 30 minutes. This talk gives an overview of how unexpected outcomes are available at any point in a large, complicated and heavily interdependent system.
12:00pm - 12:45pm

Live Panel

All speakers + Moderated by Anca Agape
12:45pm - 12:55pm


12:55pm - 1:15pm

Improving Reliability @ Meta: By Analyzing Historical Events That Led to SLO Violations

Learn about culture of tracking Service Level Indicators/Service Level Objectives at Instagram specifically and Meta in general, the tools that we use and how teams' SLI/SLO workflows can be improved by annotating SLO violations and analysing them later. In the talk we will briefly cover history of SLI/SLO tracking at Meta, then talk about how Instagram team used data annotations to tackle some of the reliability issues they had and how we're expanding this approach to the whole company.
1:15pm - 1:40pm

Service Degradation at Scale: Creating Instant Capacity

We will talk about what factors made us realize that service degradation is necessary for our infrastructure and the challenges we faced while implementing service degradation at scale. We will also speak about how we are changing our Fault Tolerance Strategy to use service degradation instead of provisioning extra buffer.
1:40pm - 2:10pm

Shrinking the Impact of Production Incidents

2:10pm - 2:30pm

Reliably Changing Configuration @ Scale

Thousands of services at Meta use Configuration Management, so it is important we change that configuration reliably. Tune in for a story spanning several years, covering how we exponentially grew coverage of a protection mechanism for one our most critical developer workflows. Along the way, we'll dive into some specifics of challenges we faced and overcame to reliably change configuration at scale.
2:30pm - 2:45pm

Meta's SEV Culture: How Today's SEVs Create Tomorrow's Reliability

Would you believe us if we said the more SEVs we have, the more reliable we are? In this talk we'll talk about the reasons why we love SEVs at Meta, and how our culture around SEVs has allowed us to build reliable services at scale. We'll start by exploring research from other industries about how incident culture shapes how reliable they are. We'll then share how we've applied these lessons to our own culture. Along the way we'll give a peek at our SEV tool, some insight into our SEV review process, and describe how we encourage a "culture of SEVs" from the very first day an engineer arrives at Meta.
2:45pm - 3:15pm

Live Q&A Session

All Speakers + Moderated by Christian Monzon

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