[CASSANDRA-16308] Add droppable tombstone metrics to nodetool tablestats - ASF JIRA

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Change Category:
Operability
Complexity:
Low Hanging Fruit
Platform:

All
Impacts:

None
Source Control Link:

https://github.com/apache/cassandra/commit/c420d754d8571120e58b2fe4838c766d26169d7d
Test and Documentation Plan:

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Followed the below steps to test:
1. ccm create test --install-dir=./cassandra (cassandra source directory with changes)
2. ccm populate -n 1
3. ccm start
4. ccm node1 nodetool tablestats: I could verify `Droppable tombstone ratio` as part of the output for each table in the output.

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Followed the below steps to test: 1. ccm create test --install-dir=./cassandra (cassandra source directory with changes) 2. ccm populate -n 1 3. ccm start 4. ccm node1 nodetool tablestats: I could verify `Droppable tombstone ratio` as part of the output for each table in the output.

This is a useful metric to troubleshoot tombstone cleanup problems and is not currently exposed on table stats.

While we're at it we should add the JMX metric to the table metrics documentation because it's currently missing.

is related to

CASSANDRA-13024 Droppable Tombstone Ratio Calculation

CASSANDRA-13023 Add droppable tombstone metrics

CASSANDRA-5159 Expose droppable tombstone ratio stats over JMX

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