We are currently using margo_init_opt() which has become deprecated in the latest Margo master branch. I'm a bit confused about how to migrate our old configuration to margo_init_ext(). At the moment, our config for the server looks something like this:

struct hg_init_info hg_options = HG_INIT_INFO_INITIALIZER;
hg_options.auto_sm = HG_TRUE;
hg_options.na_init_info.progress_mode = NA_NO_BLOCK;
margo_init_opt("some_protocol", MARGO_SERVER_MODE, &hg_options, HG_TRUE, handler_xstreams);

• Is there a default JSON config with all default values that I can then modify or do I simply leave out fields I don't need to change from default?
• Where do I define use_progress_thread and rpc_thread_count in margo_init_ext() which were the previous function arguments in margo_init_opt()? I can't find them in new interface or JSON.

Thanks!