WIP metrics list.
| metric(s) | graph | alert | comments
| ------------- | -------- | ------ | ---------------
| o.a.c.metrics.ClientRequestMetrics.ReadTimeouts | y | y | count of timeout exceptions on read
| o.a.c.metrics.ClientRequestMetrics.ReadUnavailables | y | y | count of unavailable exceptions on read
| o.a.c.metrics.ClientRequestMetrics.WriteTimeouts | y | y | count of timeout exceptions on write
| o.a.c.metrics.ClientRequestMetrics.WriteUnavailables | y | y | count of unavailable exceptions on write
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.EstimatedRowSizeHistogram | y | y | broken (the graphite reporter, apparently)
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.EstimatedColumnCountHistogram | y | y | broken (the graphite reporter, apparently)
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.ReadLatency | y | y | a histogram; latency and count/rate
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.WriteLatency | y | y | a histogram; latency and count/rate
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.SSTablesPerReadHistogram | y | y |
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.TombstoneScannedHistogram | y | y |
| o.a.c.metrics.ColumnFamily.{keyspace}.{columnfamily}.CompressionRatio | y | n |
| o.a.c.metrics.FileCache.HitRate | y | n |
| o.a.c.metrics.FileCache.Hits | y | n |
| o.a.c.metrics.FileCache.Requests | y | n |
| o.a.c.metrics.FileCache.Size | y | n |
| o.a.c.metrics.ReadRepair.Attempted | y | n |
| o.a.c.metrics.ReadRepair.RepairBackground | y | n |
| o.a.c.metrics.ReadRepair.RepairedBlocking | y | n |
| o.a.c.metrics.Storage.Exceptions | y | y |
| o.a.c.metrics.Storage.TotalHints | y | n |
| o.a.c.metrics.Storage.TotalHintsInProgress | y | y |