per metric dimensions

[jebl01]

This PR makes it possible to provide dimensions per metric. Typically by doing something like this;

final DimensionedName dimensionedName = DimensionedName.withName("test")
        .withDimension("key1", "val1")
        .withDimension("key2", "val2")
        .withDimension("key3", "val3")
        .build();

metricRegistry.counter(dimensionedName.encode()).inc();

Sadly AWS doesn't support aggregating custom metrics on dimensions (yet?), so the usefulness is more or less limited to improved search and filtering in the CloudWatch console for now...

Related to: #19

[azagniotov]

Can the .encode() be called as part of .build()? Is there a use case where we would build a DimensionedName without encoding it? Also, a requirement to invoke the .encode() explicitly may open a door to errors where a client code may forget to call the API.

Thoughts?

[jebl01]

you can always do: String myMetricName = dimensioned.encode() and then use that one over and over.

Anyhow, I have done some refactoring, and also made the API a bit easier to use... might also give a reason to keep this as it is :-)

[azagniotov]

Hi @jebl01, I released a new version