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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-499/">SRE Weekly Issue #499</a></h1>
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<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-499/">November 30, 2025</a>
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<p><a class="email_only" href="https://sreweekly.com/sre-weekly-issue-499/">View on sreweekly.com</a></p>
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<div class="sreweekly-title"><a href="https://uptimelabs.io/fixmas/" target="_blank" rel="noopener">Fix-mas Countdown</a></div>
<div class="sreweekly-description">
<p>The folks at Uptime Labs and Advanced Capacity Labs have announced an advent calendar for this December.</p>
<p>Note: In order to take part, you&#8217;ll need to provide an email address to subscribe. I gave that some serious thought before including this here, but ultimately, I have a lot of trust for the folks at both ACL and Uptime Labs, since they&#8217;ve both produced so much awesome content that&#8217;s been featured here. I&#8217;m interested to see what this collab will bring!</p>
<p>  <small>Uptime Labs and Adaptive Capacity Labs</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/airbnb-engineering/from-static-rate-limiting-to-adaptive-traffic-management-in-airbnbs-key-value-store-29362764e5c2" target="_blank" rel="noopener">From Static Rate Limiting to Adaptive Traffic Management in Airbnb’s Key-Value Store</a></div>
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<p>Cool trick: divide short-term P95 latency by the long-term P95 to detect load spikes and adjust rate limits on-the-fly.</p>
<p>&nbsp;&nbsp;<small>Shravan Gaonkar &mdash; Airbnb</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.datadoghq.com/blog/engineering/rethinking-reliability/" target="_blank" rel="noopener">Failure is inevitable: Learning from a large outage, and building for reliability in depth at Datadog</a></div>
<div class="sreweekly-description">
<p>Datadog shares the bigger-picture lessons they learned and improvements they made since their major 2023 outage, including an emphasis on graceful degradation.</p>
<p>&nbsp;&nbsp;<small>Laura de Vesine, Rob Thomas, AND Maciej Kowalewski</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.unkey.com/blog/serverless-exit" target="_blank" rel="noopener">Why we&#8217;re leaving serverless</a></div>
<div class="sreweekly-description">
<p>This article does a really good job of laying out the problems with serverless that led them to leave: having to layer on significant complexity to deal with the limits of running in Cloudflare workers.</p>
<p>&nbsp;&nbsp;<small>Andreas Thomas &mdash; Unkey</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/@oakley349/reliability-and-fault-tolerance-6861884a3433" target="_blank" rel="noopener">Reliability and Fault Tolerance</a></div>
<div class="sreweekly-description">
<p>This article explains the two concepts of reliability and fault tolerance and how they relate.</p>
<p>&nbsp;&nbsp;<small>Oakley Hall</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.reddit.com/r/sre/comments/1p1crnq/today_i_caused_a_production_incident_with_a/" target="_blank" rel="noopener">r/sre: Today I caused a production incident with a stupid bug </a></div>
<div class="sreweekly-description">
<p>This one could easily be titled, &#8220;Today, major system failures meant that I was able to take down production really easily.&#8221; There&#8217;s some great discussion in the comments, and I hope the author feels better.</p>
<p>&nbsp;&nbsp;<small>u/Deep-Jellyfish-2383 and others &mdash; reddit</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://slack.engineering/advancing-our-chef-infrastructure-safety-without-disruption/" target="_blank" rel="noopener">Advancing Our Chef Infrastructure: Safety Without Disruption</a></div>
<div class="sreweekly-description">
<p>Slack shows how they changed their monolithic Chef cookbook change deployment process to reduce risk, by breaking production up into 6 separate environments.</p>
<p>&nbsp;&nbsp;<small>Archie Gunasekara &mdash; Slack</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2025/11/02/youll-never-see-attrition-referenced-in-an-rca/" target="_blank" rel="noopener">You’ll never see attrition referenced in an RCA</a></div>
<div class="sreweekly-description">
<p>The author discusses reasons why engineer attrition won&#8217;t appear in a public incident write-up, and may well not appear in a private one, either.</p>
<p>&nbsp;&nbsp;<small>Lorin Hochstein</small></p>
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