src/main/java/com/arpnetworking/steno/Logger.java
void log(
            final LogLevel level,
            @Nullable final String event,
            @Nullable final String message,
            @Nullable final String[] dataKeys,
            @Nullable final Object[] dataValues,
            @Nullable final Throwable throwable) {
        level.log(
                getSlf4jLogger(),
                event,
                createKeysFromArray(dataKeys, MESSAGE_DATA_KEY),
                createValuesFromArray(dataValues, message),
                throwable);
    }
void log(
            final LogLevel level,
            @Nullable final String event,
            @Nullable final String message,
            @Nullable final String[] dataKeys,
            @Nullable final Object[] dataValues,
            @Nullable final Throwable throwable) {
        level.log(
                getSlf4jLogger(),
                event,
                createKeysFromArray(dataKeys, MESSAGE_DATA_KEY),
                createValuesFromArray(dataValues, message),
                throwable);
    }
/* package private