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This is a really good suggestion. Scaling up and down based on custom rules and times would ne a huge improvement.
For example one hour to scale up is kind of longand and for us usually it is based on IO load and not so much CPU.
For now cluster scaling seems to be more targeted at workloads with different CPU loads, but there is also definitely a need for IO based scaling.
For example while IO load is low M20 is sufficient, when it increases M30 with provisioned IOPS at different levels. That is something we would like to automate instead of performing manually.