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[+] add metric and dashboard for bloated indexes and tables #518
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Since there is no panel in TablesTop that shows which table is bloated, it was added based on the existing table_bloat_approx_stattuple metric.
Following the same line and based on the experience of some cases where I have seen indexes bloats, a metric based on the pgstattuple extension with the help pgstatindex (leaf_fragmentation) function is proposed.
All this was tested in PostgreSQL 12.