Correcting duplicate metric name, add index_rows_fetched #1762
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What does this PR do?
Correcting duplicate metric name: postgresql.index_rows_fetched
This metric name have been set for both REL_METRICS and IDX_METRICS.
So, I'd suggest renaming postgresql.index_rel_rows_fetched metric for REL_METRICS.
Motivation
Correcting duplicate metric name: postgresql.index_rows_fetched
A new name should be defined to prevent confusion and incorrect data in graph.
Similar to #1761