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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-453/">SRE Weekly Issue #453</a></h1>
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<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-453/">December 1, 2024</a>
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<p><a class="email_only" href="https://sreweekly.com/sre-weekly-issue-453/">View on sreweekly.com</a></p>
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<h2 style="text-align: center;font-size: 80%;color: #909090;">A message from our sponsor, <a href="https://firehydrant.com/">FireHydrant</a>:</h2>
<p>Why migrate from PagerDuty? Empower team-level ownership, reduce costs, decouple alerts from incidents, automate incidents end-to-end&#8230;to name a few. Join the growing list of companies that have made the switch. (p.s. our Signals migrator makes it simple)</p>
<p><a href="https://firehydrant.com/migrate/from-pagerduty/">https://firehydrant.com/migrate/from-pagerduty/</a></p>
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<div class="sreweekly-title"><a href="https://blog.cloudflare.com/cloudflare-incident-on-november-14-2024-resulting-in-lost-logs/" target="_blank" rel="noopener">Cloudflare incident on November 14, 2024, resulting in lost logs</a></div>
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<p>It&#8217;s a case of cascading failure, but with an interesting twist: their system was designed to handle floods but the safety mechanism was left unconfigured.</p>
<p>  <small> Jamie Herre, Tom Walwyn, Christian ndres, Gabriele Viglianisi, Mik Kocikowski, and Rian van der Merwe — Cloudflare</small></p>
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<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2024/11/28/quick-takes-on-the-latest-cloudflare-public-incident-write-up/" target="_blank" rel="noopener">Quick takes on the latest Cloudflare public incident write-up</a></div>
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<p>Lorin takes apart the Cloudflare write-up with style, including a really insightful section on safety mechanisms in complex systems.</p>
<p>  <small>Lorin Hochstein</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.fb.com/2024/11/12/security/how-meta-built-large-scale-cryptographic-monitoring/" target="_blank" rel="noopener">How Meta built large-scale cryptographic monitoring</a></div>
<div class="sreweekly-description">
<p>Meta wanted to log details about the encrypted communications in their systems to help track key use, outdated algorithms, and the like. It&#8217;s a ton of telemetry, so they did smart sampling (which they call aggregation):</p>
<blockquote>
<p>During the aggregation, a “count” is maintained for every unique event. When it comes time to flush, this count is exported along with the log to convey how often that particular event took place. </p>
</blockquote>
<p>&nbsp;&nbsp;<small>Hussain Humadi, Sasha Frolov, Rafael Misoczki, Dong Wu &mdash; Meta</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.oodle.ai/go-profiling-in-production/" target="_blank" rel="noopener">Go Profiling in Production</a></div>
<div class="sreweekly-description">
<p>A primer on using Golang&#8217;s profiling tools including CPU profiling, memory profiling, goroutine leak analysis, and execution tracing.</p>
<p>&nbsp;&nbsp;<small>Gaurav Maheshwari &mdash; Oodle</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ferd.ca/local-optimizations-don-t-lead-to-global-optimums.html" target="_blank" rel="noopener">Local Optimizations Don&#8217;t Lead to Global Optimums</a></div>
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<p>A thought-provoking piece of automation, friction, and adaptive capacity. I especially enjoyed the section on decompensation.</p>
<p>&nbsp;&nbsp;<small>Fred Hebert</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://klaviyo.tech/understanding-timings-in-distributed-systems-262fbc51441d" target="_blank" rel="noopener">Understanding Timings in Distributed Systems</a></div>
<div class="sreweekly-description">
<p>With various tools for different kinds of telemetry, these folks needed to up their game to be able to fully understand what happened in a customer request. They also needed a custom sampling strategy to make sure they didn&#8217;t miss anything important.</p>
<p>&nbsp;&nbsp;<small>Martin Fahy &mdash; Klaviyo</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ably.com/blog/ablys-four-pillars-no-scale-ceiling" target="_blank" rel="noopener">Ably&#8217;s four pillars: no scale ceiling</a></div>
<div class="sreweekly-description">
<blockquote>
<p>we’ll be looking at how Ably’s platform achieves scalability, and how, as a result, there’s no effective ceiling on the scale of applications that can be supported.</p>
</blockquote>
<p>&nbsp;&nbsp;<small>Paddy Byers &mdash; Ably</small></p>
</div>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/airbnb-engineering/building-a-user-signals-platform-at-airbnb-b236078ec82b" target="_blank" rel="noopener">Building a User Signals Platform at Airbnb</a></div>
<div class="sreweekly-description">
<p>Airbnb built a system for tracking and analyzing user actions to aid in personalization. Their system uses Flink and Kafka to handle over a million events per second.</p>
<p>&nbsp;&nbsp;<small>Kidai Kwon &mdash; Airbnb</small></p>
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