Based on the provided text, it is difficult to determine the exact subject or theme of the website. However, some possible inferences can be made:
1. The website seems to cover a wide range of topics related to software development and technology.
2. It discusses concepts such as complexity, feedback loops, cognitive systems, theory practice, analyzing incidents, erlang containers and code errors.
3. There are references to specific dates and events related to software upgrades and tools like rebar3.
4. The site may also touch upon issues related to inclusiveness in language usage and complexities of coding.
5. The mention of property-based testing suggests an emphasis on quality assurance techniques for Erlang and Elixir programming languages.
Overall, the website appears to provide insights, experiences, discussions or opinions on various aspects of software development with a focus on technologies like Erlang and Elixir.
