Grafana dashboard: Cassandra

[Cassandra exporter](https://github.com/criteo/cassandra_exporter) is a standalone application which exports Apache Cassandra® metrics throught a prometheus friendly endpoint. This project is originally a fork of JMX exporter but aims at an easier integration with Apache Cassandra®.

Specifically, this project brings :
* Exporting EstimatedHistogram metrics specific to Apache Cassandra®
* Filtering on mbean's attributes
* Metrics naming that respect the mbean hierarchy
* Comprehensive config file

An essential design choice the project makes is to not let prometheus drive the scraping frequency. This decision has been taken because a lot of Apache Cassandra® metrics are expensive to scrap and can hinder the performance of the node. As we don't want this kind of situation to happen in production, the scrape frequency is restricted via the configuration of Cassandra Exporter. 

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          "content": "### Cassandra SLA Dashboard\n#### This dashboard provides the following informations :\n_User metrics_\n* __max latencies by percentile__ : read / write / scan\n* __OPS__ : read / write\n* __Disk usage__ : live space / total space\n* __JAVA heap & non heap usage__ : current memory / max allowed\n\n_Advanced metrics_\n* __Pending operations__ :  compactions / flushes\n* __Streaming & CommitLog__ : OPS / throughput\n* __Repair ratio__ : for every keyspace\n* __Memtable statistics__\n* __Row cache__ : hit rates\n* __Thread pools metrics__ : OPS / blocked / pending",
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