HashiCorp has introduced new visualization tools in Consul 1.9 to help users troubleshoot their service mesh configurations. The new topology diagram feature allows users to visualize and debug their mesh connections, key metrics, and authorized connections between services. To use the new feature, users need to configure their service mesh by enabling connect on Consul servers, adding a connect stanza to each service, starting proxies for each service, and writing intentions between services. The visualization can help identify issues such as unauthorized connections or configuration errors. Additionally, the topology diagram provides basic metrics, including request rate, error rate, and latency, which can be configured through Prometheus integration or custom agent config files.