mod_net_proxy: Use safer util.format for generating description string (thanks tom) It appears that server_event may emit port numbers (src_port() in this case) as strings, rather than integers. This causes string.format() to throw an error. Prosody's util.format is a more forgiving formatter and won't throw an error. The server_event behaviour may be best fixed for the sake of consistency, though.

module:set_global();

local function sink_maker(config)
	local levels = {
		debug = module:measure("log.debug", "rate");
		info = module:measure("log.info", "rate");
		warn = module:measure("log.warn", "rate");
		error = module:measure("log.error", "rate");
	};
	return function (_, level)
		return levels[level]();
	end
end

require"core.loggingmanager".register_sink_type("measure", sink_maker);