[Flow Control] Observability (Prom Metrics, not Tracing) #1708
Description
What would you like to be added: Add prometheus metrics for the experimental Flow Control layer. This will provide essential visibility into the performance and behavior of this layer.
Some suggested metrics include:
- WIP: will add shortly in the comment thread.
Why is this needed: Operability and observability. These metrics may provide several additional benefits:
- Backpressure Signals: The metrics can be used as a context-rich source for backpressure signals.
- Enhanced Autoscaling: The metrics will enable more intelligent autoscaling decisions.
- Custom L7LB Balancing: The metrics can be used to inform custom routing decisions in a Layer 7 load balancer across EPP replicas.