Cassandra-exporter
Cassandra-exporter，在6400的基础上修改
修改
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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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