Tracking index usage with Insights

PlanetScale Insights has introduced a new index tracking feature to help developers monitor which indexes their queries are using and how that usage is changing over time. This feature provides a graph showing the percentage of queries using each index, as well as cumulative usage data. It also allows users to search for queries based on specific indexes or find unindexed queries. The implementation includes extracting query index usage information from MySQL and aggregating it into Insights every 15 seconds.