• Add Code Source links by @Kludex in #451 and #505
• Add fastapi arguments attributes directly on the root OTEL span, remove use_opentelemetry_instrumentation kwarg by @alexmojaki in #509
• Allow setting tags on logfire spans by @AdolfoVillalobos in #497
• Add logger name to LogfireLoggingHandler spans by @samuelcolvin in #534
• Format None as None instead of null in messages by @alexmojaki in #525
• Use PYTEST_VERSION instead of PYTEST_CURRENT_TEST to detect logfire.configure() being called within a pytest run but outside any test by @Kludex in #531