How do you backup your ec2 cloudwatch metrics? How do you visualize different measurements with different scales at once, like cpu% and i/o? How do you combine your application server metrics (like 'viewed products per hour') with cloudwatch metrics (cpu per hour)?
I thought about storing raw cloudwatch metrics in s3 first and then using munin for visualization. But maybe there is a more advanced approach which is more interactive than munin's static images.