Support metric rollup for different dimensionset values

[natangsalgia]

Currently, if a metric has dimensions and customers need to create alarms on metrics aggregated across all the values of the dimensions, customers need to emit the same metric with different combination of the dimensionset.

Example:

1. DimensionSet: [d1, d2, d3]
2. Possible Dimension Values: d1:[d1_1, d1_2]; d2:[d2_1, d2_2]; d3:[d3_1, d3_2]

If user wants to create alarms on all values of [d1, d2, d3], they need to add all combinations to the MetricsLogger.
[[d1, d2, d3],[d1, d2],[d1, d3],[d2, d3],[d1],[d2],[d3],[]]

Request here is to provide a mechanism in this library to automatically populate all combinations for the dimensions.

Example:
metricsLogger.putDimensionSetCombination(DimensionSet.of(d1, d1_1, d2, d2_2, d3, d3_1)) should add [[d1, d2, d3],[d1, d2],[d1, d3],[d2, d3],[d1],[d2],[d3],[]] as the dimensionset in the log.

[Stephen-Bao]

Hi @natangsalgia,
According to your description, you're trying to create CloudWatch Alarms on a specific metric name while aggregating over different dimensions. I believe there're multiple ways to do that:

1. Using the metric math expression: https://stackoverflow.com/questions/60160703/cloudwatch-alarm-across-all-dimensions-based-on-metric-name-for-custom-metrics
2. Using a new common dimension if applicable: https://stackoverflow.com/questions/48443899/cloudwatch-does-not-aggregate-across-dimensions-for-your-custom-metrics

From my point of view, publishing the same metric with different combination of the dimensionset wouldn't enable you to aggreate over dimensions. Maybe I'm getting something wrong here and if it's the case, feel free to provide me with more context about your application and I'll be more than happy to help.