1. Proposed title of this feature request

Circuit breaker monitoring, Logging capabilities

2. What is the nature and description of the request?

Circuit breaker is a completely black box. We don't have any visibility on what is happening inside the circuit breaker. Through this RFE, customers would like to measure and monitor when the circuit break is opened and closed, what the underlying errors and timeout events are, how many/which 5XX errors occurred, and whether the timeout is honored, etc.

3. Why does the customer need this? (List the business requirements here)

As customers are facing latency issues. Without this, their need for service mesh will not be complete

4. List any affected packages or components.
circuit breakers, ENvoy proxy, timeouts

5. What is the business impact that you are facing? How many customers are affected by this?

For customers building a transactional internet web banking application for India's largest bank, and expect a very high throughput. Bank currently has 5 billion customers and is growing at 30% per year. Since this is a Banking application, this is a must-have feature.