Many logs are printing suddenly

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1

I’m developing a crawling engine with selenium.
I edited my codes and APT-GET to update.
Many logs are printing suddenly after this updates.

My spec and setting is following.
Then the logs.

root@ubuntu:/home/ubuntu/docker/docker-selenium# docker version
Client:
Version: 1.12.4
API version: 1.24
Go version: go1.6.4
Git commit: 1564f02
Built: Mon Dec 12 23:50:16 2016
OS/Arch: linux/amd64

Server:
Version: 1.12.4
API version: 1.24
Go version: go1.6.4
Git commit: 1564f02
Built: Mon Dec 12 23:50:16 2016
OS/Arch: linux/amd64
root@ubuntu:/home/ubuntu/docker/docker-selenium#

Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/app/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]