Thanks for raising your requirement.
We do have plans to support custom metrics. We are currently in the development phase . In the meantime , we would like to understand about your usage , in case of custom metrics. It would be great , if you can share the following details
1. Dimensions used.
2. Statistics preferred for these metrics(for alerting).
3. How you classify those metrics?(For example , a custom metric shall be used for a particular instance of type cx.large. How do you prefer to see that classification , in case of metric data being shown?)
With respect to CloudWatch Alarms, we will add this to our product roadmap. We will update you on this pretty soon.
Ananthkumar K S