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See https://app.diagrams.net/ -- you'll recognize the style.

so that seems to be: https://github.com/jgraph/drawio

I use the same service, but I always knew it as draw.io. Never noticed when they started redirecting to this domain.

This is very valuable to me as a Linux user in a Microsoft Platinum partner org because I can't run Visio natively.

It looks very much like OmniGraffle.

And adding a new system is a pretty big deal at a large company so keeping it up to date isn't that difficult.

I meant how do they track the data? If they're just doing it manually that makes sense though it seems inefficient...

can such a diagram be generated using text markup ? i want to have this in revision control and then generate this in a static page (Nextjs or Gatsbyjs)

It’s a bit clunky, but Graphviz and its DOT language[1] might do the trick.

[1] https://en.m.wikipedia.org/wiki/Graphviz

mermaidjs [0] can do class diagrams that look kind of like this. It integrates into markdown via Jekyll easily, so I assume it will work well with gatsby.

It’s a basic text only structure so it actually diffs pretty well so I can see a merge request with a new node or new relationship.

[0] https://mermaid-js.github.io/mermaid/#/