mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

local statsman = require "core.statsmanager";
local st = require "util.stanza";
local s_format = string.format;

module:add_feature("http://jabber.org/protocol/stats");

module:hook("iq/host/http://jabber.org/protocol/stats:query", function (event)
	local origin, stanza = event.origin, event.stanza;
	local stats, _, extra = statsman.get_stats();
	local reply = st.reply(stanza);
	reply:tag("query", { xmlns = "http://jabber.org/protocol/stats" });
	for stat, value in pairs(stats) do
		local unit = extra[stat] and extra[stat].units;
		reply:tag("stat", { name = stat, unit = unit, value = s_format("%.12g", value) }):up();
	end
	origin.send(reply);
	return true;
end)