sensu-plugins-aws
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add Freeable memory metric to metrics-rds.rb
Pull Request Checklist
Is this in reference to an existing issue? no
General
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[x] Update Changelog following the conventions laid out here
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[x] Update README with any necessary configuration snippets
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[x] Binstubs are created if needed
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[ ] RuboCop passes
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[ ] 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.