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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-498/">SRE Weekly Issue #498</a></h1>
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<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-498/">November 23, 2025</a>
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<a class="email_only" href="https://sreweekly.com/sre-weekly-issue-498/">View on sreweekly.com</a>
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<h2 style="text-align: center;font-size: 80%;color: #909090;">A message from our sponsor, <a href="http://costory.io/">Costory</a>:</h2>
<p><strong>You didn’t sign up to do FinOps.</strong>
<strong>Costory</strong> automatically explains <em>why</em> your cloud costs change, and reports it straight to Slack.
Built for <strong>SREs</strong> who want to code, not wrestle with spreadsheets.
<strong>Now on AWS &amp; GCP Marketplaces.</strong></p><p>Start your free trial at <a href="https://sreweekly.com/link/498">costory.io</a></p>
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<div class="sreweekly-title"><a href="https://blog.cloudflare.com/18-november-2025-outage/" target="_blank" rel="noopener">Cloudflare outage on November 18, 2025</a></div>
<div class="sreweekly-description"><p>Cloudflare had a major incident this week, and they say it was their worst since 2019. In this report, they explain what happened, and the failure mode is pretty interesting.</p>
<p>&nbsp;&nbsp;<small>Matthew Prince &mdash; Cloudflare</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/airbnb-engineering/building-a-next-generation-key-value-store-at-airbnb-0de8465ba354" target="_blank" rel="noopener">Building a Next-Generation Key-Value Store at Airbnb</a></div>
<div class="sreweekly-description"><blockquote>
<p>How we completely rearchitected Mussel, our storage engine for derived data, and lessons learned from the migration from Mussel V1 to V2.</p>
</blockquote>
<p>They cover not just the motivation for and improvements in V2, but also the migration process to deploy V2 without interruption.</p>
<p>&nbsp;&nbsp;<small>Shravan Gaonkar &mdash; Airbnb</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://netflixtechblog.com/building-a-resilient-data-platform-with-write-ahead-log-at-netflix-127b6712359a" target="_blank" rel="noopener">Building a Resilient Data Platform with Write-Ahead Log at Netflix</a></div>
<div class="sreweekly-description"><p>Netflix&#8217;s WAL service acts as a go-between, streaming data to pluggable targets while providing extra functionality like retries, delayed sending, and a dead-letter queue.</p>
<p>&nbsp;&nbsp;<small>Prudhviraj Karumanchi, Samuel Fu, Sriram Rangarajan, Vidhya Arvind, Yun Wang, and John Lu &mdash; Netflix</small></p></div></div>
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<div class="sreweekly-title"><a href="https://www.datadoghq.com/blog/engineering/husky-query-architecture/" target="_blank" rel="noopener">Inside Husky’s query engine: Real-time access to 100 trillion events</a></div>
<div class="sreweekly-description"><p>A (very) deep dive into Datadog&#8217;s custom data store, with special attention to how it handles query planning and optimization.</p>
<p>&nbsp;&nbsp;<small>Sami Tabet &mdash; Datadog</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2025/10/04/two-thought-experiments/" target="_blank" rel="noopener">Two thought experiments</a></div>
<div class="sreweekly-description"><blockquote>
<p>Perhaps we should encourage people to write their incident reports as if they will be consumed by an AI SRE tool that will use it to learn as much as possible about the work involved in diagnosing and remediating incidents in your company.</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Lorin Hochstein</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://klaviyo.tech/building-a-resilient-event-publisher-with-dual-failure-capture-518749cb5600" target="_blank" rel="noopener">Building a Resilient Event Publisher with Dual Failure Capture</a></div>
<div class="sreweekly-description"><blockquote>
<p>we landed on a two-level failure capture design that combines Kafka topics with an S3 backup to ensure no event is ever lost.</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Tanya Fesenko, Collin Crowell, Dmitry Mamyrin, and Chinmay Sawaji &mdash; Klaviyo</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ably.com/blog/multi-region-resilience-aws-outage" target="_blank" rel="noopener">AWS us-east-1 outage: How Ably’s multi-region architecture held up</a></div>
<div class="sreweekly-description"><p>Buried in this one is this gem: the last layer of reliability is that their client library automatically retries to alternate regions if the main region fails.</p>
<p>&nbsp;&nbsp;<small>Paddy Byers &mdash; Ably</small></p></div></div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://incident.io/blog/service-disruption-october-20th-2025" target="_blank" rel="noopener">Service disruption on October 20, 2025</a></div>
<div class="sreweekly-description"><p>incident.io shares details on how they fared during the AWS us-east-1 incident on October 20.</p>
<p>&nbsp;&nbsp;<small>Pete Hamilton &mdash; incident.io</small></p></div></div>
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