mysql threads running high issue for Percona Mysql 8.0.16
Lots of threads?  Do SHOW PROCESSLIST.  If most say Sleep, then there is nothing to worry about.

Load Average = 2 and CPU = 15%.  Do you have 16 cores in your CPU?  Of so, that says you are using about 2 of the 16.  Again, no problem.

Are queries taking a long time?  Let's see them, their EXPLAIN, and SHOW CREATE TABLE.

How much RAM do you have?  How big is your dataset?  What is the value of innodb_buffer_pool_size?