Features

• #183 User claim in JWT auth is now configurable, previously its default value is sub
• #189 Add kafka version config
• #190 Add integration tests for three supported DBs. MySQL, PostgreSQL, and Sqlite3
• #200 Add GET /flags?preload=true to get preloaded segments and variants
• #205 Add datadog apm support
• #208 Add retry for DB connection

Bug fixes

• #186 CORS middleware fixes
• #191 Fix middleware orders to better catch panic errors