Deployment

Consider this suggested deployment:

Cross reference with high availability docs:

3 or 5 freno nodes form a freno highly available service
One of them is elected leader, and it is the only node to:
- Continuously probe backend stores
- Serve /check queries
HAProxy service directs all traffic to the single active node
Clients consult with freno via HAProxy. They will implicitly connect to the leader node.
Based on freno's response they will either write or refrain from writing to backend stores.