• Support OpenTelemetry 1.39.0, drop support for earlier versions, stop using the OTel events API/SDK by @alexmojaki in #1562
• Add new_trace parameter to logfire.instrument by @njz-cvm in #1499
• Fix JSON serialization error with instrument_google_genai by @alexmojaki in #1551
• Support kwargs in ProxyLogger emit() by @qianl15 in #1561