From cbeed94b0811429200a1fadb72a72b5e11d81e4b Mon Sep 17 00:00:00 2001
From: Ivana Kellyer <ivana.kellyer@sentry.io>
Date: Thu, 24 Sep 2026 11:13:22 +0200
Subject: [PATCH 1/2] chore: Deprecate send_default_pii

---
 sentry_sdk/client.py |  8 ++++++++
 sentry_sdk/utils.py  | 10 ++++++++++
 tests/test_client.py |  6 ++++++
 3 files changed, 24 insertions(+)

diff --git a/sentry_sdk/client.py b/sentry_sdk/client.py
index e3c6370c9c..26cebfa741 100644
--- a/sentry_sdk/client.py
+++ b/sentry_sdk/client.py
@@ -56,6 +56,7 @@
     capture_internal_exceptions,
     current_stacktrace,
     datetime_from_isoformat,
+    deprecation_warning,
     env_to_bool,
     format_timestamp,
     get_before_send_log,
@@ -350,6 +351,13 @@ def _get_options(*args: "Optional[str]", **kwargs: "Any") -> "Dict[str, Any]":
     if rv["enable_tracing"] is True and rv["traces_sample_rate"] is None:
         rv["traces_sample_rate"] = 1.0
 
+    if rv["send_default_pii"] is None:
+        deprecation_warning(
+            "The send_default_pii option is deprecated. Use data_collection "
+            "instead. "
+            "See https://docs.sentry.io/platforms/python/data-management/data-collected/"
+        )
+
     rv["data_collection"] = _resolve_data_collection(rv)
 
     # Do not add the event scrubber if data collection is enabled as it can remove data that's
diff --git a/sentry_sdk/utils.py b/sentry_sdk/utils.py
index 2e20a789b8..310cc0fd23 100644
--- a/sentry_sdk/utils.py
+++ b/sentry_sdk/utils.py
@@ -10,6 +10,7 @@
 import sys
 import threading
 import time
+import warnings
 from collections import namedtuple
 from contextlib import contextmanager
 from datetime import datetime, timezone
@@ -2209,3 +2210,12 @@ def serialize_attribute(val: "AttributeValue") -> "SerializedAttributeValue":
 @contextmanager
 def nullcontext() -> "Iterator[None]":
     yield
+
+
+def deprecation_warning(msg: str) -> None:
+    """
+    Emit a warnings.warn about a deprecation.
+
+    For other types of warnings, use logger.warning().
+    """
+    warnings.warn(msg, stacklevel=3, category=DeprecationWarning)
diff --git a/tests/test_client.py b/tests/test_client.py
index ad08932690..64d7b90087 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -1485,6 +1485,12 @@ def test_enable_tracing_deprecated(sentry_init, enable_tracing):
         sentry_init(enable_tracing=enable_tracing)
 
 
+@pytest.mark.parametrize("send_default_pii", [True, False])
+def test_send_default_pii_deprecated(sentry_init, send_default_pii):
+    with pytest.warns(DeprecationWarning):
+        sentry_init(send_default_pii=send_default_pii)
+
+
 def test_ignore_spans_warns_without_streaming(sentry_init):
     with pytest.warns(UserWarning, match=r"`ignore_spans` parameter only works"):
         sentry_init(ignore_spans=["/health"], trace_lifecycle="static")

From 2cee6be6b3dfd719a6bea1bb54868b76ceb089e6 Mon Sep 17 00:00:00 2001
From: Ivana Kellyer <ivana.kellyer@sentry.io>
Date: Thu, 24 Sep 2026 11:16:54 +0200
Subject: [PATCH 2/2] .

---
 sentry_sdk/client.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sentry_sdk/client.py b/sentry_sdk/client.py
index 26cebfa741..54c306b4b4 100644
--- a/sentry_sdk/client.py
+++ b/sentry_sdk/client.py
@@ -351,7 +351,7 @@ def _get_options(*args: "Optional[str]", **kwargs: "Any") -> "Dict[str, Any]":
     if rv["enable_tracing"] is True and rv["traces_sample_rate"] is None:
         rv["traces_sample_rate"] = 1.0
 
-    if rv["send_default_pii"] is None:
+    if rv["send_default_pii"] is not None:
         deprecation_warning(
             "The send_default_pii option is deprecated. Use data_collection "
             "instead. "