Allow nested metadata properties

[jeffhollan]

Creating as this came up as a request during a standup. Some scalers like Azure Monitor may require a number of metadata options to configure, and today we require metadata be a flat list:

(hypothetical example)

metadata:
  connectionName:
  connectionType:
  connectionSubscription:
  metricType:
  metricName:
  metricThreshold:

We could consider allowing nesting or other ways to more easily define like:

metadata:
  connection:
    name:
    type:
    subscription:
  metric:
    type:
    name:
    threshold:

Open for discussion and upvotes 👍

[tomkerkhove]

More than happy to see this being added 🙌

[stale]

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