카산드라 모니터링 메트릭 

- cassandra 3.0부터는 ops center가 없기 때문에 devops가 잘 살펴봐야 한다. 



https://www.datadoghq.com/blog/how-to-monitor-cassandra-performance-metrics/


https://github.com/QuentinAmbard/cassandra-troubleshooting


https://wiki.apache.org/cassandra/Metrics


https://www.datadoghq.com/blog/how-to-collect-cassandra-metrics/


http://www.datastax.com/dev/blog/pluggable-metrics-reporting-in-cassandra-2-0-2


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