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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-290/">SRE Weekly Issue #290</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-290/">October 3, 2021</a>
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<a href="https://sreweekly.com/sre-weekly-issue-290/" title="Permalink to SRE Weekly Issue #290" class="email_only">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="https://rootly.io/?utm_source=sreweekly">Rootly</a>:</h2>
<p>Manage incidents directly from Slack with Rootly 🚒. Automate manual admin tasks like creating incident channel, Jira and Zoom, paging the right team, postmortem timeline, setting up reminders, and more. Book a demo:<br />
<a href="https://rootly.io/?utm_source=sreweekly">https://rootly.io/?utm_source=sreweekly</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ayende.com/blog/194785-B/postmortem-partial-ravendb-cloud-outage?Key=b35f9f49-5930-4782-9f07-513c1437b21e" target="_blank" rel="noopener"> Postmortem: Partial RavenDB Cloud outage</a></div>
<div class="sreweekly-description">
<p>Despite carefully testing how they would handle this week&#8217;s expiration of the root CA that cross-signed Let&#8217;s Encrypt&#8217;s CA certificate, they had an outage. The reason? Poor behavior in OpenSSL. See the next article for a deeper explanation of what went wrong with OpenSSL.</p>
<p><small>Oren Eini — RavenDB</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/@sleevi_/path-building-vs-path-verifying-the-chain-of-pain-9fbab861d7d6" target="_blank" rel="noopener">Path Building vs Path Verifying: The Chain of Pain</a></div>
<div class="sreweekly-description">
<p>This article explains why some versions of OpenSSL are unable to validate certificates issued by Let&#8217;s Encrypt now, even though the certificates should be considered valid.</p>
<p><small>Ryan Sleevi</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.techrepublic.com/article/stop-adopting-multicloud-to-achieve-application-resilience-says-honeycombs-charity-majors/" target="_blank" rel="noopener">Stop adopting multicloud to achieve application resilience, says Honeycomb&#8217;s Charity Majors</a></div>
<div class="sreweekly-description">
<p>This says it all:</p>
<blockquote><p>It turns out that the path to safety isn&#8217;t increased complexity.</p></blockquote>
<p><small>Matt Asay — TechRepublic</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://firehydrant.io/blog/reliability-is-not-an-engineering-metric/" target="_blank" rel="noopener">Reliability is not an engineering metric</a></div>
<div class="sreweekly-description">
<p>The thrust of this article is that reliability applies to and should matter to the entire company, not just engineering. I really like the term &#8220;pitchfork alerting&#8221;.</p>
<p><small>Robert Ross — FireHydrant</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://iximiuz.com/en/posts/reverse-proxy-http-keep-alive-and-502s/?utm_medium=reddit&amp;utm_source=r_sre" target="_blank" rel="noopener">How HTTP Keep-Alive can cause TCP race condition</a></div>
<div class="sreweekly-description">
<p>Lesson learned: always make your application server&#8217;s timeout longer than your reverse proxy&#8217;s.</p>
<p><small>Ivan Velichko</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2021/09/26/the-strange-beauty-of-strange-loop-failure-modes/" target="_blank" rel="noopener">The strange beauty of strange loop failure modes</a></div>
<div class="sreweekly-description">
<p>Who deploys the deploy tool? The deploy tool, obviously — unless it&#8217;s down.</p>
<p><small>Lorin Hochstein</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://github.blog/2021-09-27-partitioning-githubs-relational-databases-scale/" target="_blank" rel="noopener">Partitioning GitHub’s relational databases to handle scale</a></div>
<div class="sreweekly-description">
<p>Their approach: group tables into &#8220;schema domains&#8221;, make sure that queries don&#8217;t span schema domains, and then move a schema domain to its own separate database cluster.</p>
<p><small>Thomas Maurer — GitHub</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://tech.ebayinc.com/research/groot-ebays-event-graph-based-approach-for-root-cause-analysis/" target="_blank" rel="noopener">Groot: eBay’s Event-graph-based Approach for Root Cause Analysis</a></div>
<div class="sreweekly-description">
<p>Groot is about helping figure out what&#8217;s wrong during an incident, not about analyzing an incident after the fact. I totally get why they need this tool, since they have over <strong>5000 microservices</strong>!</p>
<p><small> Hanzhang Wang — eBay</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.srepath.com/sre-not-monolithic-role/" target="_blank" rel="noopener">SRE is not a monolithic role</a></div>
<div class="sreweekly-description">
<blockquote><p>SRE is a broad, overarching responsibility that needs a multitude of role considerations to pull off properly.</p></blockquote>
<p><small>Ash P — Cruform</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://status.heroku.com/incidents/2362">Heroku</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">(also <a href="https://status.heroku.com/incidents/2361">this one</a>)Heroku had a major outage that coincided with an Amazon EBS failure in a single availability zone in us-east1. Customers of Heroku such as <a href="https://status.deadmanssnitch.com/incidents/ctkhr3fq72t3">Dead Man&#8217;s Snitch</a> were impacted.</li>
</ul>
</li>
<li><a href="https://status.slack.com/2021-09/06c1e17de93e7dc2">Slack</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Slack had a big disruption related to DNSSEC. Here&#8217;s an interesting analysis of what may have gone wrong (<a href="https://lists.dns-oarc.net/pipermail/dns-operations/2021-September/021340.html">link</a>).</li>
</ul>
</li>
<li><a href="https://letsencrypt.status.io/pages/incident/55957a99e800baa4470002da/6155ea52e170e905361624e3">Let&#8217;s Encrypt</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Let&#8217;s Encrypt saw heavy traffic as everyone clamored to renew their certificates, causing certificate issuance to slow down.</li>
</ul>
</li>
<li><a href="https://www.bleepingcomputer.com/news/microsoft/microsoft-365-mfa-outage-locks-users-out-of-their-accounts/">Microsoft 365</a></li>
<li><a href="https://www.theapplepost.com/2021/10/02/apples-find-my-service-down-for-some-users/">Apple’s &#8220;Find My&#8221; service</a></li>
<li><a href="https://twitter.com/signalapp/status/1442354759009247232">Signal</a></li>
<li><a href="https://status.xero.com/incidents/06qfl3kj4p0j">Xero</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This one coincided with the same Amazon EBS outage mentioned above. Xero also had <a href="https://status.xero.com/incidents/d24f1j2kxq5v">another</a> outage on October 1.</li>
</ul>
</li>
</ul>
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