# Feature Articles Published articles for Feature Articles. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## CAA DNS Issuer-Critical Flags Are Confusing to Configure DevFeed: [CAA DNS Issuer-Critical Flags Are Confusing to Configure]() Original publisher: [Read original article]() Author: Remy Porter Published: 2026-09-10T06:30:00Z Content type: opinion Language: en Sources: [The Daily WTF]() Topics: [certificates](), [domain]() Tags: [bits](), [boolean](), [certificates](), [documentation](), [feature-articles](), [flag](), [https](), [readability]() ### AI overview The article examines confusion around the issuer-critical flag in DNS CAA records. It explains that the flag is defined as a bitmask, while many users interpret the documentation as requiring the integer 1 instead of the value representing the specified bit, creating a dilemma for certificate issuers such as LetsEncrypt. ### Source excerpt I'm not a DNS person, in that I appreciate that it exists but am not up on the inner workings. It solves a lot of problems with dark magic I don't fully understand, and fortunately don't need to. But Lucio noticed something that I do think is interesting, within the scope of the CAA record type. The CAA record started with RFC6844, which was obsoleted by RFC8659. Both RFCs lay out the same core idea: you can add a CAA record to your DNS entries to say, "hey, this domain over here is allowed to issue certificates for me". That's the sort of thing that enables LetsEncrypt to hand out certs, and is an important part of why we can run HTTPS everywhere these days. Now, RFC6844 has this in it: Issuer Critical: If set to '1', indicates that the corresponding property tag MUST be understood if the semantics of the CAA record are to be correctly interpreted by an issuer. Issuers MUST NOT issue certificates for a domain if the relevant CAA Resource Record set contains unknown property tags that have the Critical bit set. The issuer critical flag means that the certificate issuer needs to validate your CAA record before it issues a certificate for you. There's more in the RFC about what exactly that means, but we don't care about those details for right now. The rule here is "set a flag to 1". A little later in the RFC, the flag is described in more detail- as a bitmask. Specifically, bit 0 is the issuer critical flag. Bits 1-7 are reserved for future use. Now, here's where we get into trouble, because programmers don't understand bits, and because the CAA record expects you to put an integer in this field. So, if you want issuer critical enabled, what value to you put in this field? 128, obviously. That's 10000000. Except, if you don't understand bits, that's not obvious. A lot of people read this and decided that the documentation meant they needed to put 1 in the field- aka 00000001. This is wrong. The updated RFC tries to explain it a bit more clearly: Bit 0, Issuer Critic ## A Software Contractor Is Ignored After a Key Employee Dies DevFeed: [A Software Contractor Is Ignored After a Key Employee Dies]() Original publisher: [Read original article]() Author: Ellis Morning Published: 2026-09-08T06:30:00Z Content type: opinion Language: en Sources: [The Daily WTF]() Topics: [Software](), [Development](), [coding]() Tags: [analysis](), [development](), [feature-articles](), [software]() ### AI overview An anonymous software contractor describes being hired to analyze a company's core program, then being largely ignored for about 18 months after the employee who hired them died. During that time, the contractor built a development environment and was eventually dismissed. ### Source excerpt From our anonymous submitter: Having reached the end of the road at a company increasingly swallowed up companies further east which you'd never believe were still afloat, I found myself headhunted for certain specialty software skills. I was reaching the final few years of my expected working span, so I jumped at the chance. The money was (to me at that time) spectacularly good, so I jumped into it. It started when my first day was spent by me being sent home for the weeks it was still going to take to onboard me. Not bad, engaged to wait, as it were, and the first 6 months was thus and so. The man who had interviewed me, call him Fred, was intelligent and urbane, and was a joy to meet. He and I clearly hit it off, and lo and behold I was in. It was he who gave me my first assignment, which was mathematical analysis of their core milk-cow program because they needed to find out what it did, and how it did it, so they could perhaps implement it in a more contemporary language. So I did that, and was just about to publish my findings with him, when Fred inconveniently dropped dead suddenly. In the what-are-we-going-to-do-now-our-key-man-is-no-more confusion, we contractors were forgotten. For the next 18 months or so (may have been more, may have been less) I was more or less ignored. I spent the time writing a development environment to work on any part of the program conveniently, all the while sitting next to a man who was constantly, forcefully and repetitiously speaking ill of the managers in his line structure. The ridiculously garrulous boss who inherited me thought little of me, and handed me the little work that came my way with active hostility. One or two good guys, but mostly a cabal of elderly men trying to preserve their little money-spinner as long as they could, and a johnny-come-lately trying to increase (and even introduce) automatic processes was less than welcome. During that time I spent quite some time on TDWTF, submitting a gem or two here and ## Why Output Metrics Can Miss Problems in Complex Production Systems DevFeed: [Why Output Metrics Can Miss Problems in Complex Production Systems]() Original publisher: [Read original article]() Author: Remy Porter Published: 2026-09-02T06:30:00Z Content type: opinion Language: en Sources: [The Daily WTF]() Topics: [Monitoring](), [dashboards](), [robot sense of touch](), [Embedded Software Dev](), [Databases](), [Computer vision]() Tags: [algorithm](), [computer-vision](), [databases](), [embedded](), [feature-articles](), [manufacturing](), [metrics](), [monitoring](), [robotics](), [widget]() ### AI overview This commentary examines a metrics-driven manufacturing team whose automated production line combines robotics, embedded firmware, web-based monitoring tools, and PLC code. It argues that tracking output and limited performance metrics does not adequately explain how such a complex system behaves or why bottlenecks occur. ### Source excerpt Rachel joined a new team which was proudly "metrics driven". When she first met with her boss, Zane, he explained his thinking. "We need to be data-driven to make good decisions, right? We're a manufacturing company. We make widgets. At the end of the day, we need to make the most widgets for the lowest cost of goods sold. So we track that, and that feeds into every decision." The team oversaw an automated production line, which meant the software was a mix of robotics, embedded firmware, high-level web based monitoring tools, and thickets of dreaded PLC code. And because you can't build an entire factory for test purposes, they only way they could test real-world scales with real-world data was to roll changes out to production. They could simulate, they could run tests on subsets of the system, but a change in the production line software couldn't truly be validated until it rolled out into the real world. Rachel's first task on the new team involved making some changes to their metrics dashboard. It was viewed as a good way to get her feet wet with the new team. As it turned out, the metrics dashboard was a Google Sheet, with a complex series of formulas that involved multi-level INDEX functions- essentially querying the spreadsheets like they were a database. Why not use an actual database? Oh, they did -- six actually -- but the company obeyed Remy's Law of Requirements Gathering: "no matter what the requirements the users ask for, what they really wanted was Excel". The database data was pulled into the spreadsheet for reporting. Now, a complicated sheet pulling in data from not one, but six different databases, they must have a pretty complex model to explain how changes to their software would impact productivity. And since they needed to model the software to make predictions about how it'd behave in production, that model must be extremely useful. Of course it wasn't. The only metrics they tracked were output metrics, variations on "widgets produced per unit ## A World Cup-Era Police Software Project Faced Severe Staffing and Infrastructure Constraints DevFeed: [A World Cup-Era Police Software Project Faced Severe Staffing and Infrastructure Constraints]() Original publisher: [Read original article]() Author: Ellis Morning Published: 2026-08-31T06:30:00Z Content type: opinion Language: en Sources: [The Daily WTF]() Topics: [Software](), [systems](), [Website](), [App](), [servers](), [incident]() Tags: [app](), [brazil](), [bugs](), [feature-articles](), [hiring](), [onboarding](), [real-time](), [server](), [software](), [systems](), [website]() ### AI overview An anonymous submitter recounts a rushed 2014 project in Brazil to build a police system before the World Cup. The project combined public websites, police-car location tracking, automated reporting, and real-time incident submissions, but faced severe staffing, scheduling, infrastructure, and software bug problems. ### Source excerpt All I can say in response to our anonymous submitter's story is, ALMOST?! With the World Cup being hosted in North America this year, I remembered this story that happened back in 2014. At the time I was working in Brazil, for a company that builds software systems for public services. And, with the World Cup being hosted there, in came the opportunity for local agencies to invest in modernization, with pretty much a blank check to get new services, so long as it was deployed before the end of the World Cup. And so the sales people did what they did best, and went around trying to upsell whoever would be willing to buy -- no matter our actual capacity for developing the things. So it was that I was pulled into this new fancy digital system for the police force of a state capital. However, we had only about 4 engineers available, and what they sold was a project estimated for a team of 20, to be delivered in 3 months, with no room for delay. And it wasn't just our core C&D product, but this massive thing with customized public-facing websites, live tracking of the position of different police cars delivered to a tablet in each car, automated reporting, etc. First thing: We received a pile of 24 resumes, and were told to choose 16 of those. Maybe 3 were acceptable, but we had to waste 1 month hiring and onboarding 13 other people who were worse than useless. Classic man-month problem. We eventually had to tell management that nothing would be delivered this way, so they did the very best next thing: fly us to this other city, so we could work embedded there, in full crunch mode for the delivery. We pretty much worked 12+ hours a day, 7 days a week, for those next 2 weeks. Another situation: they wanted this system where people could take a photo of an incident in progress, and submit via this app + website, to be verified by an operator in real-time. We nicknamed it the "dick-pic encyclopedia." Even worse, we only had the budget to run a single server, so this thing re