[DISCUSS] PIP-3 Introduce metrics for Paimon

[Guojun Li]

Hi, Paimon Devs,
     I’d like to start a discussion about PIP-3[1].
     In this PIP, I'm talking about how to support metrics for paimon, what
metrics paimon needs. Look forward to your question and suggestions.

Best,
Guojun

[1]
https://cwiki.apache.org/confluence/display/PAIMON/PIP-3%3A+Introduce+metrics+for+Paimon