new knative filtering

[ryandawsonuk]

We're using sourceAndType filters but they were deprecated and have now been removed. Seems like the new way is more powerful

[ryandawsonuk]

The minimum to do this would just be to update knative version, change v1alpha1 to v1 and change

  filter:
    sourceAndType:
      type: io.seldon.serving.inference.request

to

  filter:
    attributes:
      type: io.seldon.serving.inference.request

But it seems there's also potential to add extra custom attributes so that we could filter by attributes such as which model the event is for.

Also affects kfserving

[ryandawsonuk]

Looks like we could use multiple filters so that an outlier detector trigger could be filtered to just requests for a particular model