What the metadata env value do?

[psionic-k]

https://github.com/leptos-rs/start-axum/blame/0448e6dbeb6edef2ca9e83bdaf08867ebfe43ab2/Cargo.toml#L84

I can't see what is reacting to this value or when it would be set to "PROD". Is it only read for certain deployment solutions?

[gbj]

Isn't it deserialized into the env field of LeptosOptions? It's purely optional but users can use that to toggle between (for example) development and production databases, depending on deployment.