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https://issues.apache.org/jira/browse/CASSANDRA-14572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-14572:
-----------------------------------------
    Component/s: Observability
                 Metrics

> Expose all table metrics in virtual table
> -----------------------------------------
>
>                 Key: CASSANDRA-14572
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14572
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Metrics, Observability
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Minor
>              Labels: virtual-tables
>
> While we want a number of virtual tables to display data in a way thats great 
> and intuitive like in nodetool. There is also much for being able to expose 
> the metrics we have for tooling via CQL instead of JMX. This is more for the 
> tooling and adhoc advanced users who know exactly what they are looking for.
> *Schema:*
> Initial idea is to expose data via {{((keyspace, table), metric)}} with a 
> column for each metric value. Could also use a Map or UDT instead of the 
> column based that can be a bit more specific to each metric type. To that end 
> there can be a {{metric_type}} column and then a UDT for each metric type 
> filled in, or a single value with more of a Map<Text, Text> style. I am 
> purposing the column type though as with {{ALLOW FILTERING}} it does allow 
> more extensive query capabilities.
> *Implementations:*
> * Use reflection to grab all the metrics from TableMetrics (see: 
> CASSANDRA-7622 impl). This is easiest and least abrasive towards new metric 
> implementors... but its reflection and a kinda a bad idea.
> * Add a hook in TableMetrics to register with this virtual table when 
> registering
> * Pull from the CassandraMetrics registery (either reporter or iterate 
> through metrics query on read of virtual table)



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