Tag Apple system log messages as public.

Author: freakboy3742

Misc/NEWS.d/next/macOS/2026-05-31-10-40-00.gh-issue-150644.zLWyjj.rst

@@ -0,0 +1,3 @@
+When system logging is enabled (with ``config.use_system_logger``, messages
+are now tagged as public. This allows the macOS 26 system logger to view
+messages without special configuration.

Python/pylifecycle.c

@@ -3327,7 +3327,9 @@ apple_log_write_impl(PyObject *self, PyObject *args)
 
     // Pass the user-provided text through explicit %s formatting
     // to avoid % literals being interpreted as a formatting directive.
-    os_log_with_type(OS_LOG_DEFAULT, logtype, "%s", text);
+    // Using {public} ensures "dynamic" string messages are visible
+    // in the log without special configuration.
+    os_log_with_type(OS_LOG_DEFAULT, logtype, "%{public}s", text);
     Py_RETURN_NONE;
 }