willholley opened a new pull request #2410: Mango metrics URL: https://github.com/apache/couchdb/pull/2410 <!-- Thank you for your contribution! Please file this form by replacing the Markdown comments with your text. If a section needs no action - remove it. Also remember, that CouchDB uses the Review-Then-Commit (RTC) model of code collaboration. Positive feedback is represented +1 from committers and negative is a -1. The -1 also means veto, and needs to be addressed to proceed. Once there are no objections, the PR can be merged by a CouchDB committer. See: http://couchdb.apache.org/bylaws.html#decisions for more info. --> ## Overview Improve instrumentation of Mango with the following metrics: * `mango.query_invalid_index`: number of mango queries that generated an invalid index warning * `mango, docs_examined`: number of documents examined by mango queries (the same value returned by execution_stats for individual queries) * `mango,quorum_docs_examined`: number of documents examined by mango queries, using cluster quorum * `mango.results_returned`: number of rows returned by mango queries * `mango.query_time`: histogram of the length of time processing mango queries * `mango.too_many_docs_scanned`: number of mango queries that generated an index scan warning ## Testing recommendations Make some Mango queries and call `_node/_local/_stats/mango` to view the metrics. ## Related Issues or Pull Requests * Prior art: https://github.com/apache/couchdb/issues/1913 * Documentation PR: https://github.com/apache/couchdb-documentation/pull/469 ## Checklist - [ ] Code is written and works correctly - [ ] Changes are covered by tests - [ ] Any new configurable parameters are documented in `rel/overlay/etc/default.ini` - [ ] A PR for documentation changes has been made in https://github.com/apache/couchdb-documentation
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