CBDH Performance Monitoring & Optimization 2

Question 1

Which combination exposes Prometheus-scrapable metrics on a Fabric peer?

Accepted Answer

Set metrics.provider to prometheus and configure operations.listenAddress

Answer

The operations service serves a /metrics endpoint when metrics.provider is prometheus and operations.listenAddress is set.

Question 2

Which operations-service endpoint reports whether a peer or orderer is healthy?

Accepted Answer

/healthz

Answer

The operations service exposes /healthz for liveness and health checks.

Question 3

Which tool is the Hyperledger project for benchmarking a blockchain network's TPS and latency?

Accepted Answer

Hyperledger Caliper

Answer

Caliper runs configurable workloads against a system under test and reports throughput and latency.

Question 4

How can you change a peer's log level at runtime without restarting it?

Accepted Answer

Send a PUT to the operations service /logspec endpoint

Answer

The operations service /logspec endpoint lets you read and set the log specification dynamically.

Question 5

Which metrics providers can Fabric nodes be configured to use?

Accepted Answer

Prometheus, StatsD, or disabled

Answer

The metrics.provider setting accepts prometheus, statsd, or disabled.

CBDH - Certified Blockchain Developer Hyperledger Practice Test