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#graphmystery

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varx
varx/tech @varx@infosec.exchange · 5d ago
Over the last 13 years as a software dev at SaaS companies, I've developed a fondness for graphs. I spend a lot of time staring at them to answer questions (mostly boiling down to "Why is the website sad?" and "Wait, *is* the site sad?") and I've learned to configure and read them quite well. But there are still many mysteries. I think it might be fun (and educational) to present a series of graphs with interesting patterns to see what other people think. Sometimes, I'll have my own answer. Sometimes I won't! I'm calling it #GraphMystery and I'll be posting them in this thread.
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varx
varx/tech @varx@infosec.exchange · 5d ago
Replying to @varx@infosec.exchange
I likely won't be answering many questions about information not already in the posts. I'm using my discretion here as an experienced operator to determine which information my employer would consider sensitive—often that's "what does it do" and "what's the scale on that Y axis". I also mostly work with open source software, which makes this somewhat less fraught. I think it would be cool if other people post their own graphs to this hashtag, but... use your own judgement. Think about what you would feel comfortable sharing in a public bug report against a library. #GraphMystery
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varx
varx/tech @varx@infosec.exchange · 5d ago
Replying to @varx@infosec.exchange
Here's the first puzzle, a warm-up. This is a recent heat map of memory usage in an HTTP service. What caused these four prominent "spurs" you see along the top? (More context, not all necessarily relevant: The service is running in Kubernetes, so the samples represent containers, each container running multiple workers. The Y axis, not shown, starts at zero. Time zone for X axis is unspecified.) Anything else can you figure out from this graph? #GraphMystery
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