code: public final void setLogLevel(@NonNull final LogLevel logLevel) {
          Condition.INSTANCE.ensureNotNull(logLevel, "The log level may not be null");
          this.logLevel = logLevel;
      }
docs: Sets the log level. Only log messages with a rank greater or equal than the rank of the
  currently applied log level, are written to the output.
  
  @param logLevel
  The log level, which should be set, as a value of the enum {@link LogLevel}. The log
  level may not be null