2016-03-02 14:58:09 EST [14366]: [8-1] LOG: could not resolve "localhost": Name or service not known
2016-03-02 14:58:09 EST [14366]: [9-1] LOG: disabling statistics collector for lack of working socket
I'm reasonably certain the above is the root of the problem.
2016-03-02 14:58:09 EST [14366]: [10-1] WARNING: autovacuum not started because of misconfiguration
2016-03-02 14:58:09 EST [14366]: [11-1] HINT: Enable the "track_counts" option.
This is simply a symptom. The hint is misleading in this situation.
Someone more informed can hopefully offer more guidance fixing your localhost resolution problem.
David J.
