Datadog Python APM Tracer (ddtrace)

Datadog APM Python tracing library. Current version: 4.6.4 (Mar 2026). Three breaking major versions since 2023: v2 (dropped Python 2.7/3.5/3.6, removed DD_CALL_BASIC_CONFIG), v3 (dropped Python 3.7, removed deprecated config names), v4 (dropped Python 3.8, removed Pin class, removed Span.set_tag_str, removed ddtrace.settings package). Preferred usage is ddtrace-run CLI wrapper — NOT importing patch_all() in code. Requires Datadog Agent running separately. Auto-instrumentation patches libraries at import time.