jmx_exporter Cassandra GC pattern help

[apz-s58]

Hi all

I am running openjdk 11.0.16.1 2022-08-12 and trying to scrape 

cassandra_gc_collection_time

cassandra_gc_duration
cassandra_gc_stats

using jmx_exporter

I confirmed using JConsole that C* is exposing atleast one of these metrics (collection_time) and when I use ".*" as pattern in jmx_config file I am able to see this metric at the /metric endpoint but with my current pattern I am not able to scrape it and need help with that. So far I have tried these patterns:

- pattern: java.lang<type=GarbageCollector, name=(G1 Yong Generation)><>CollectionCount name: cassandra_gc_collection_count type: GAUGE labels: name: "$1"

- pattern: java.lang<type=GarbageCollector, name=(.+)><>(CollectionCount) name: cassandra_gc_collection_count type: GAUGE labels: name: "$1"

Any help would be appreciated.