B) The Log Service frontend service adopts an LVS + NGINX architecture and C) The Logstore backend service is deployed on a single machine to complete the real-time persistence, indexing, query and delivery of Logstore data to MaxCompute and D) Each log written to the Log Service backend will be saved in triplicate (across three separate physical servers)

A) As an agent for collecting logs, Logtail can collect logs from existing system log files in a non-intrusive manner