add Freeable memory metric to metrics-rds.rb #395
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Pull Request Checklist
Is this in reference to an existing issue?
no
General
Update Changelog following the conventions laid out here
Update README with any necessary configuration snippets
Binstubs are created if needed
RuboCop passes
Existing tests pass
Purpose
RDS Freeable memory is quite useful metric when using RDS. Because you don't have any other memory related metric you can lean on.
Known Compatibility Issues