How can I further understand the meaning of "Metric arguments"?

[xieyunjiao]

Thank you very much for your excellent work. When I was studying, I was a little confused about understanding METRICS.

Metric arguments:
        'METRICS': ['HOTA','CLEAR', 'Identity', 'VACE', 'JAndF']

I may have missed a lot of knowledge, can you give me some advice or pointers? Thank you very much for your reply.