@Option(names = {"-v", "--verbose"}, description = {
        "Specify multiple -v options to increase verbosity.",
        "For example, `-v -v -v` or `-vvv`"})
    public void setVerbose(boolean[] verbosity) {
        getTopLevelCommandLoggingMixin(mixee).verbosity = verbosity;
    }
Taken from https://github.com/remkop/picocli/blob/master/picocli-examples/src/main/java/picocli/examples/logging_mixin_advanced/LoggingMixin.java
migration-assistant/src/main/java/io/apiman/migration/util/LoggingMixin.java