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'

module:set_global();

local measure = require"core.statsmanager".measure;
local pposix = require"util.pposix";

local measures = {};
setmetatable(measures, {
	__index = function (t, k)
		local m = measure("amount", "memory."..k); t[k] = m; return m;
	end
});
module:hook("stats-update", function ()
	local m = measures;
	for k, v in pairs(pposix.meminfo()) do
		m[k](v);
	end
end);