willholley commented on issue #1913: Add Metric to count unindexed mango queries URL: https://github.com/apache/couchdb/issues/1913#issuecomment-570942768 @janl if that's the requirement, I think it would be a better signal to highlight queries with a high ratio between docs examined and results returned, implying the index isn't narrowing the result set enough. We actually have a warning in (Fauxton)[https://github.com/apache/couchdb-fauxton/blob/4ae5bfb2d9ac571543da646b07e14a3e9623a510/app/addons/documents/mango/components/ExecutionStats.js#L44] when this ratio is 10:1 but it should really be a server-generated warning instead, with a corresponding metric. Similarly, we [already capture](https://github.com/apache/couchdb/blob/5ef18802cb82169843bd32edee838d4302d0dd97/src/mango/src/mango_execution_stats.erl#L85) the number of docs examined and number of results returned for each query so could add metrics for those. I can look at it this week if there's agreement it would be useful.
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