This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.
The Logs UI provides real-time log tailing in a compact, customizable display. The log data is correlated with metrics in the Infrastructure UI, making it easier for you to diagnose problems. You can stream the logs in real time, or load the new data manually. Logs are streamed from top to bottom, making it easier for you to explore the logs in real time and see a historical view of your log data. The search bar in the log viewer supports Kibana Query Language. You can enter ad hoc or structured queries.
For more information about working with the Logs UI, see the Kibana documentation.
Intro to Kibana
ELK for Logs & Metrics