v.20.3Backward Incompatible Changes
Use OS Thread ID for Logging in ClickHouse to Fix Log Compatibility Issues
Use OS thread id everywhere instead of internal thread number. This fixes #7477 Oldclickhouse-clientcannot receive logs that are send from the server when the settingsend_logs_levelis enabled, because the names and types of the structured log messages were changed. On the other hand, different server versions can send logs with different types to each other. When you don't use thesend_logs_levelsetting, you should not care. #8954 (alexey-milovidov)