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9:27:09.888 [main] DEBUG io.netty.util.internal.NativeLibraryLoader - netty_transport_native_epoll_x86_64 cannot be loaded from java.libary.path,
       now trying export to -Dio.netty.native.workdir: /tmpjava.lang.UnsatisfiedLinkError: 
       no netty_transport_native_epoll_x86_64 in java.library.path: [/usr/java/packages/lib, /usr/lib64, /lib64, /lib, /usr/lib]
    at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2660)
    at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:829)
    at java.base/java.lang.System.loadLibrary(System.java:1867)
    at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
    at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:349)
    at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:136)

As in the latter case this is only a DEBUG log. The library will fall back to Java NIO. In order to get rid of this log you may either change log level or add dependency on native transports. Please note that you may encounter some incompatibility problems on musl libc based distros, eg. Alpine Linux.

CBS Client

When cbsClient.updates() will yield an event?

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