2019-03-09 20:20:02.915630 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:03.915861 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:04.916075 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:05.916367 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:06.916587 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:07.916832 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
2019-03-09 20:20:08.917088 I | http: Accept error: accept unix /var/run/docker.sock: accept4: too many open files; retrying in 1s
issue is clearly a docker.sock connection leak.