About how to use the JMX to monitor Trino and Why Alluxio doesn't accelerate the Trino query

[YuanYunjing]

I'm integrating Trino with Alluxio.

To know why there is no effect shows, I need to monitor the access delay of Hive Metastore.
But on the trino website, I didn't find the introduction of the JMX Metrics of Trino. Seeing them from SQL query is too hard to find the right Metric to use，so I want to ask if there are some guide to use the JMX Metrics of Trino?

Besides, after integrating Trino with Alluxio, I finded the query speed is not faster than the query of Trino and HDFS. And only when I reboot Trino, the query will be slow, that's the only change in query speed. So does anyone know why it shows like this?

Thank you!