Hi, there:
       What are latest good tools for monitoring open source cassandra ?  
I was used to Datastax opscenter tool, felt all tasks quite easy. Now on new project, open source cassandra, on Kubernetes container/docker, logs in Splunk,  feel very challenge.
Most wanted metrics are read / write latency, read / write time out.

Any advice is welcome.  I appreciate your help!

Thanks,

James