Include the dev alias when launching the REPL to use local source code rather than released modules. This is covered in the https://github.com/steffan-westcott/clj-otel#developing.

@U2C6SPLDS but can i do it using docker?

Use whatever your normal development process provides for starting a REPL. Somewhere you need to specify what aliases to enable. For example, I use Cursive which has an aliases option as part of the run configuration.

I followed the documentation, I added a "dev" aliases with override-deps and I'm running lein for dev, but it doesn't work lol

From your other questions, it seems you do not need to be making changes to clj-otel . Instead, be sure to use the functionality it already provides.