Latest commit ee7c3c6 Jan 25, 2017 @ploxiln ploxiln new --log-prefix flag / option for nsqd, nsqlookupd, nsqadmin
instantiate Logger in $APP.New() instead of $APP.NewOptions(),
only if not already present in opts

Now, setting Logger to nil in Options is not sufficient
to disable logging. A no-op logger must be created and assigned.

README.md

nsqlookupd

nsqlookupd is the daemon that manages topology metadata and serves client requests to discover the location of topics at runtime.

Read the docs