fix(asyncpg): add db.driver to connect span and cleanup docs

Author: harryautomazione

MIGRATION_GUIDE.md

@@ -190,41 +190,3 @@ Looking to upgrade from Sentry SDK 1.x to 2.x? Here's a comprehensive list of wh
 - Deprecated `sentry_sdk.transport.Transport.capture_event`. Please use `sentry_sdk.transport.Transport.capture_envelope`, instead.
 - Passing a function to `sentry_sdk.init`'s `transport` keyword argument has been deprecated. If you wish to provide a custom transport, please pass a `sentry_sdk.transport.Transport` instance or a subclass.
 - The parameter `propagate_hub` in `ThreadingIntegration()` was deprecated and renamed to `propagate_scope`.
-
-## Migrating Span Filtering to Span First
-
-If you are using the experimental **Span First** mode (also known as span streaming, enabled via `_experiments={"trace_lifecycle": "stream"}`), you might notice that individual spans are sent in real-time and do not pass together through `before_send_transaction`.
-
-To filter or ignore individual spans in Span First mode, you can use the experimental `ignore_spans` configuration option:
-
-```python
-import sentry_sdk
-import re
-
-sentry_sdk.init(
-    dsn="...",
-    traces_sample_rate=1.0,  # Required for tracing
-    _experiments={
-        "trace_lifecycle": "stream",
-        "ignore_spans": [
-            "ignore_this_exact_name",  # 1. Match by name (String)
-            re.compile(r"^GET /static/.*"),  # 2. Match by name (Regex Range)
-            {"name": "ignore_by_name_dict"},  # 3. Match by name (Dict)
-            {  # 4. Match by Span Attribute
-                "attributes": {
-                    "http.status_code": 200,
-                }
-            }
-        ]
-    }
-)
-```
-
-### Key Differences:
-- **Before (Transaction Mode)**: You filtered child spans by mutating `event["spans"]` inside `before_send_transaction`.
-- **After (Span First)**: You define rules up-front in `ignore_spans`. If a rule matches, a `NoOpStreamedSpan` is returned immediately resulting in no overhead.
-- **Inheritance**: Any child span started with an ignored parent will automatically be ignored as well.
-
-> [!NOTE]
-> `ignore_spans` is currently an experimental feature reading from `_experiments`.
-

sentry_sdk/integrations/asyncpg.py

@@ -169,6 +169,7 @@ async def _inner(*args: "Any", **kwargs: "Any") -> "T":
             origin=AsyncPGIntegration.origin,
         ) as span:
             span.set_data(SPANDATA.DB_SYSTEM, "postgresql")
+            span.set_data("db.driver", "asyncpg")
             addr = kwargs.get("addr")
             if addr:
                 try: