Seems like 15.x are missing a Prefer for go1.24:

 unresolvable: have choice for go >= 1.23.5: go1.23 go1.24 

(from https://build.opensuse.org/package/show/home:ojkastl_buildservice:Branch_server_monitoring/alloy)

Could one of the project maintainers add this to the prjconf, please?