Is your feature request related to a problem? Please describe.
I would like to route events to triggers based on the global event count. This way, one can for example "offload" 30% of events to a different trigger. The easiest way would be to expose argo_events_event_service_running_total metric as a variable I guess, or at least interduce some stateful counter() function available in triggers condition field.

Thanks

Describe the solution you'd like

Simple one:

apiVersion: argoproj.io/v1alpha1
kind: Sensor
metadata:
  name: aws-sqs
spec:
  dependencies:
    - name: test-dep
      eventSourceName: aws-sqs
      eventName: example
  triggers:
    - template:
        name: workflow_foo
        conditions: "counter() % 3 == 0"
    - template:
        name: workflow_bar
        conditions: "counter() % 3 != 0"

with a weight field:

apiVersion: argoproj.io/v1alpha1
kind: Sensor
metadata:
  name: aws-sqs
spec:
  dependencies:
    - name: test-dep
      eventSourceName: aws-sqs
      eventName: example
  triggers:
    - template:
        name: workflow_foo
        weight: 30
    - template:
        name: workflow_bar
        weight: 70

Describe alternatives you've considered
Do this before Argo Events

Additional context

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