How to use the cf-nodejs-logging-support.setLoggingLevel function in cf-nodejs-logging-support

var messages = [];
var pub = redis.createClient();
var sub = redis.createClient();

// setup redis publisher and subscriber
sub.subscribe("message", "sync");
pub.on("connect", redisConnectionHandler);
sub.on("connect", redisConnectionHandler);
pub.on("end", redisEndHandler);
sub.on("end", redisEndHandler);
pub.on("error", redisErrorHandler);
sub.on("error", redisErrorHandler);

// set the minimum logging level
log.setLoggingLevel("info");

// parse body json params
app.use(express.json());       

// inserts the logger in the server network queue, so each time a https request is recieved, it is will get logged.
app.use(log.logNetwork);

app.use("/", express.static(__dirname + "/public"));

// setup CF port
var port = Number(process.env.VCAP_APP_PORT || 8080);
app.listen(port, function () {
    //write a message using the logMessage method of the logger.
    log.logMessage("info", "listening on port: %d", port);
});

var sub = redis.createClient();

// setup redis publisher and subscriber
sub.subscribe("message", "sync");
pub.on("connect", redisConnectionHandler);
sub.on("connect", redisConnectionHandler);
pub.on("end", redisEndHandler);
sub.on("end", redisEndHandler);
pub.on("error", redisErrorHandler);
sub.on("error", redisErrorHandler);

// force logger to run restify version. (default is express, forcing express is also legal)
log.forceLogger("restify");

// set the logging level threshold
log.setLoggingLevel("info");

// register names of custom fields
log.registerCustomFields(["node_version", "pid", "platform"])

// setup serving of static files
app.get("/*", restify.plugins.serveStatic({
    directory: "./public",
    default: "index.html"
}));

// insert the logger as middleware to log each request.
app.use(log.logNetwork);

// parse body json params
app.use(restify.plugins.bodyParser({ mapParams: true }));

var messages = [];
var pub = redis.createClient();
var sub = redis.createClient();

// setup redis publisher and subscriber
sub.subscribe("message", "sync");
pub.on("connect", redisConnectionHandler);
sub.on("connect", redisConnectionHandler);
pub.on("end", redisEndHandler);
sub.on("end", redisEndHandler);
pub.on("error", redisErrorHandler);
sub.on("error", redisErrorHandler);

// set the logging level threshold
log.setLoggingLevel("info");

// register names of custom fields
log.registerCustomFields(["node_version", "pid", "platform"])

// parse body json params
app.use(express.json());       

// add logger to the server network queue to log all incoming requests.
app.use(log.logNetwork);

// host static files
app.use("/", express.static(__dirname + "/public"));

// set port and run server
var port = Number(process.env.VCAP_APP_PORT || 8080);
app.listen(port, function () {

var sub = redis.createClient();

// setup redis publisher and subscriber
sub.subscribe("message", "sync");
pub.on("connect", redisConnectionHandler);
sub.on("connect", redisConnectionHandler);
pub.on("end", redisEndHandler);
sub.on("end", redisEndHandler);
pub.on("error", redisErrorHandler);
sub.on("error", redisErrorHandler);

// force logger to run restify version. (default is express, forcing express is also legal)
log.forceLogger("restify");

// set the minimum logging level
log.setLoggingLevel("info");

// setup serving of static files
app.get("/*", restify.plugins.serveStatic({
    directory: "./public",
    default: "index.html"
}));

// insert the logger as middleware to log each request.
app.use(log.logNetwork);

// parse body json params
app.use(restify.plugins.bodyParser({ mapParams: true }));

// setup CF port
var port = Number(process.env.VCAP_APP_PORT || 8080);
app.listen(port, function () {