Question about scheduler and print out learning rate

[turbosonics]

I tried to test scheduler using something like this:

    --lr=0.002 \
    --scheduler="ReduceLROnPlateau" \
    --lr_factor=0.5 \
    --scheduler_patience=50 \

But I couldn't find any input parameter to designate the metric for the scheduler. Usually, what metric is used for scheduler & scheduler patience?

Also, I'm using
--error_table="PerAtomMAE"
But I couldn't find any learning rate data printed out to log file or result file. How can I print out learning rate per each epoch?

Thanks.