You will receive a positive integer for the number of floors. Your challenge will build a pyramid with a "#" character. As usual, the shortest solution wins.
When I try to debug using the docker image intersystemsdc/iris-community it is failing. If I change to intersystemsdc/iris-community:2022.3.0.555.0-zpm, I have success.
Sorry, change to: intersystemsdc/iris-community:2022.1.0.209.0-zpm
The new $system.external interface (aka "InterSystems External Servers") is used to call/integrate with external language code/libraries, it replace the old gateways (for example Java gateway) that required the import of proxy objects.
Note that the documentation for the old gateways has been removed from IRIS, so only the new $system.external interface is somewhat (i.e. insufficiently) documented.
Regarding the migration from old gateway to new $system.external interface the documentation says:
We've added a new channel to the Developer Community Discord Server, #platforms. This is a good place to discuss issues related to Operating Systems, CPU architectures, and Containers supported by InterSystems products.