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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-515/">SRE Weekly Issue #515</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-515/">May 3, 2026</a>
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<p><a class="email_only" href="https://sreweekly.com/sre-weekly-issue-515/">View on sreweekly.com</a></p>
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<p>Building scalable, high-performance infrastructure for AI is one of today’s toughest challenges. Join @Scale: Systems &amp; Reliability on June 25 in Bellevue, WA to learn how leading engineers are solving it.</p>
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<div class="sreweekly-title"><a href="https://blog.stackademic.com/the-silent-failure-of-reliability-metrics-at-scale-lessons-learned-from-a-decade-of-broken-metrics-ff33bde20df7" target="_blank" rel="noopener">The Silent Failure of Reliability Metrics at Scale: Lessons Learned from a Decade of Broken Metrics</a></div>
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<blockquote>
<p>Why Reliability Metrics Age Faster Than the Systems They Measure</p>
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<p>Is your dashboard always green because everything is working, or because your metrics are lying?</p>
<p>&nbsp;&nbsp;<small>Barnadeep Bhowmik &mdash; Stackademic</small></p>
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<div class="sreweekly-title"><a href="https://www.datadoghq.com/blog/engineering/debugging-postgres-performance/" target="_blank" rel="noopener">When upserts don&#8217;t update but still write: Debugging Postgres performance at scale</a></div>
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<blockquote>
<p>But when we rolled out the new query, disk writes doubled and Write-Ahead Logging (WAL) syncs quadrupled. We discovered that even when an upsert doesn’t change any values, it still locks the conflicting row, which is recorded in the WAL.</p>
</blockquote>
<p>Yikes! Click through to learn how they figured it out and what they did about it.</p>
<p>&nbsp;&nbsp;<small>Anthonin Bonnefoy &mdash; Datadog</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://uptimelabs.io/articles/incidents-will-happen-are-you-actually-prepared/" target="_blank" rel="noopener">Incidents *Will* Happen. Are You (Actually) Prepared?</a></div>
<div class="sreweekly-description">
<p>it&#8217;s important not just to try to prevent incidents but to be fully ready for them when they inevitably happen anyway.</p>
<p>  <small>Joe Mckevitt — Uptime Labs</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/queues-dont-absorb-load-they-delay-bankruptcy-1" target="_blank" rel="noopener">Why Queues Don’t Fix Scaling Problems</a></div>
<div class="sreweekly-description">
<blockquote>
<p>Queues absorb spikes but not sustained overload. Without backpressure, limits, and monitoring, backlogs grow until systems fail.</p>
</blockquote>
<p>&nbsp;&nbsp;<small> David Iyanu Jonathan &mdash; DZone</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://pckt.blog/b/jcalabro/april-2026-outage-post-mortem-219ebg2" target="_blank" rel="noopener">April 2026 Outage Post-Mortem</a></div>
<div class="sreweekly-description">
<p>Oof. The code exhausted all ephemeral ports and then they logged itself to death complaining about it. I love the workaround. Loopback is a <tt>/8</tt>!</p>
<p>  <small>Jim Calabro — Bluesky</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2026/04/12/thoughts-on-the-bluesky-public-incident-write-up/" target="_blank" rel="noopener">Thoughts on the Bluesky public incident write-up</a></div>
<div class="sreweekly-description">
<p>&#8230;and here&#8217;s an awesome analysis and explanation of the Bluesky writeup. I&#8217;ve definitely been down the path of <a href="https://web.archive.org/web/20230526170209/https://blog.heroku.com/sockets-in-a-bind">scratching my head about EADDRINUSE</a> before.</p>
<p>  <small>Lorin Hochstein</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://mixpanel.substack.com/p/how-we-reduced-median-memory-estimation" target="_blank" rel="noopener">How We Reduced Median Memory Estimation Error by 99%, With the Help of AI</a></div>
<div class="sreweekly-description">
<p>AI didn&#8217;t solve the problem for them, but it sped up the grunt-work and significantly reduced their iteration time, letting them get to an answer much faster.</p>
<p>&nbsp;&nbsp;<small>Tristan Streichenberger &mdash; Mixpanel</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.anthropic.com/engineering/april-23-postmortem" target="_blank" rel="noopener">An update on recent Claude Code quality reports</a></div>
<div class="sreweekly-description">
<p>It&#8217;s interesting to me that this is essentially an outage/degradation report, but the definition of system degradation for an LLM tool is much more subjective than with traditional services. The &#8220;ablation testing&#8221; concept is really neat.</p>
<p>&nbsp;&nbsp;<small>Anthropic</small></p>
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