Gen_AI spans now streamed; FastAPI sync handler double-wrapping fixed

TL;DR

• gen_ai spans now stream as Streamed Spans by default — prevents drops on large transactions (>1000 spans) and removes size-based AI message truncation; self-hosted users can opt out with stream_gen_ai_spans=False.
• New aiomysql integration for async MySQL tracing; added automatic HTTPX2 instrumentation.
• MCP SDK v2 handler signature is now supported in the MCP integration.
• url.full, url.query, url.path, and url.fragment are now consistently gated behind send_default_pii across aiohttp, asyncpg, boto3, httpx, sanic, tornado, wsgi, stdlib, and ASGI integrations.
• FastAPI: fixed double-wrapping of sync handlers on FastAPI ≥ 0.137 and incorrect route paths for prefixed routers.

Release notes

New Features

In 2.62.0 a new aiomysql integration lands for async MySQL query tracing — add AioMySQLIntegration() to your integrations list to enable it. The same release adds automatic HTTPX2 support: requests made through the httpx2 package are instrumented with no extra setup required.

2.64.0 makes gen_ai use streamed spans (v2) by default, rather than transaction-based spans (v1). Previously AI spans were embedded inside their parent transaction and subject to the same payload size limits; with streaming they travel as independent v2 envelope items. This means they can no longer be dropped when a transaction payload grows too large, and AI message data is no longer truncated by the SDK. Self-hosted Sentry users whose instance does not yet support streamed spans should opt out via stream_gen_ai_spans=False.

Also in 2.64.0, the MCP integration now handles the handler signature introduced in MCP SDK v2, where the request_ctx parameter was removed.

Bug Fixes

In 2.63.0, FastAPI ≥ 0.137 sync route handlers were being wrapped twice, interfering with some middleware patterns. The SDK now checks for an existing wrapper before applying its own. Additionally, transaction names for routes nested inside prefixed routers now use the effective routed path rather than the raw route string.

2.64.0 tightens PII gating across a broad set of integrations. Multiple integrations — aiohttp, asyncpg, boto3, httpx, httpx2, pyreqwest, sanic, stdlib, starlette, tornado, wsgi, and ASGI — were including full URLs including query strings in span attributes unconditionally. url.full, url.path, url.query, and url.fragment are now only included when send_default_pii=True.

In 2.62.0, the RQ integration was missing functools.wraps() on patched job functions, causing the wrapped function's __name__ and other metadata to be lost. This is now preserved.