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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-502/">SRE Weekly Issue #502</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-502/">December 21, 2025</a>
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<p><a class="email_only" href="https://sreweekly.com/sre-weekly-issue-502/">View on sreweekly.com</a></p>
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<div class="sreweekly-title"><a href="https://blog.cloudflare.com/eliminating-cold-starts-2-shard-and-conquer/" target="_blank" rel="noopener">Eliminating Cold Starts 2: shard and conquer</a></div>
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<p>Cloudflare reduced their cold-start rate for Workers requests through sharding and consistent hashing, with an interesting solution for load shedding.</p>
<p>&nbsp;&nbsp;<small>Harris Hancock &mdash; Cloudflare</small></p>
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<div class="sreweekly-title"><a href="https://blog.railway.com/p/using-logs-metrics-traces-and-alerts-to-understand-system-failures" target="_blank" rel="noopener">Monitoring &#038; Observability: Using Logs, Metrics, Traces, and Alerts to Understand System Failures</a></div>
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<p>I appreciate the way this article also shares how each of logs, metrics, traces, and alerts has its downsides, and what you can do instead. FYI, there&#8217;s also a fairly extensive product-specific second half about observabilty on Railway.</p>
<p>&nbsp;&nbsp;<small>Mahmoud Abdelwahab &mdash; Railway</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.adaptivecapacitylabs.com/2025/11/11/uptime-labs-building-expertise-in-incident-response/" target="_blank" rel="noopener">Uptime Labs: Building Expertise in Incident Response</a></div>
<div class="sreweekly-description">
<p>I don&#8217;t often include direct product introductions like this explanation of Uptime Labs&#8217;s incident simulation platform from Adaptive Capacity Labs. I&#8217;m making an exception in this case because I feel that incident simulation has huge potential to improve reliability, and I see very few articles about it.</p>
<p>&nbsp;&nbsp;<small>John Allspaw &mdash; Adaptive Capacity Labs</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://rosesecurity.dev/2025/11/14/kiss-versus-dry-iac.html" target="_blank" rel="noopener">KISS vs DRY in Infrastructure as Code: Why Simple Often Beats Clever</a></div>
<div class="sreweekly-description">
<p>IaC may bring more trouble than it solves, and it may simply move or hide complexity, according to this article.</p>
<p>&nbsp;&nbsp;<small>RoseSecurity</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ferd.ca/notes/paper-the-failure-gap.html" target="_blank" rel="noopener">Paper: The Failure Gap</a></div>
<div class="sreweekly-description">
<blockquote>
<p>[&#8230;] the failure gap, which is the idea that people vastly underestimate the actual number and rate of failures that happen in the world compared to successes.</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Fred Hebert &mdash; summary</small></p>
<p>&nbsp;&nbsp;<small>Lauren Eskreis-Winkler, Kaitlin Woolley, Minhee Kim, and Eliana Polimeni &mdash; original paper</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://brooker.co.za/blog/2025/11/20/what-now.html" target="_blank" rel="noopener">What Now? Handling Errors in Large Systems</a></div>
<div class="sreweekly-description">
<p>This one&#8217;s fun. You get to play along with the author, voting on an error handling strategy and then seeing what the author thinks and why.</p>
<p>&nbsp;&nbsp;<small>Marc Brooker</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.opsworker.ai/blog/agent-driven-sre-investigations-a-practical-deep-dive-into-multi-agent-incident-response/" target="_blank" rel="noopener">Agent-Driven SRE Investigations: A Practical Deep Dive into Multi-Agent Incident Response</a></div>
<div class="sreweekly-description">
<p>A chronicle of an sandboxed experiment in using multiple instances of Claude to investigate incidents. I like the level of detail and transparency in their experimental setup.</p>
<p>&nbsp;&nbsp;<small>Ar Hakboian &mdash; OpsWorker.ai</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2025/11/26/brief-thoughts-on-the-recent-cloudflare-outage/" target="_blank" rel="noopener">Brief thoughts on the recent Cloudflare outage</a></div>
<div class="sreweekly-description">
<p>I have a bit of an article backlog, so note that this is about the <em>November</em> outage, not the more recent outage on December 5.</p>
<p>  <small>Lorin Hochstein</small></p>
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