Remove Hub and related code for good. (#3446)

* Removed hub based functions from sessions implementation
* Removed scope manager
* Removed hub from tracing
* Removed hub from apidocs
* Updated migration guide
* Updated migration guide

Author: antonpirker

MIGRATION_GUIDE.md

@@ -9,8 +9,20 @@ Looking to upgrade from Sentry SDK 2.x to 3.x? Here's a comprehensive list of wh
 
 ### Changed
 
+- The `Span()` constructor does not accept a `hub` parameter anymore.
+- `Span.finish()` does not accept a `hub` parameter anymore.
+- The `Profile()` constructor does not accept a `hub` parameter anymore.
+- A `Profile` object does not have a `.hub` property anymore.
+
 ### Removed
 
+- Class `Hub` has been removed.
+- Class `_ScopeManager` has been removed.
+- The context manager `auto_session_tracking()` has been removed. Use `track_session()` instead.
+- The context manager `auto_session_tracking_scope()` has been removed. Use `track_session()` instead.
+- Utility function `is_auto_session_tracking_enabled()` has been removed. There is no public replacement. There is a private `_is_auto_session_tracking_enabled()` (if you absolutely need this function) It accepts a `scope` parameter instead of the previously used `hub` parameter. 
+- Utility function `is_auto_session_tracking_enabled_scope()` has been removed. There is no public replacement. There is a private `_is_auto_session_tracking_enabled()` (if you absolutely need this function)
+
 ### Deprecated
 
 

docs/apidocs.rst

@@ -2,9 +2,6 @@
 API Docs
 ========
 
-.. autoclass:: sentry_sdk.Hub
-    :members:
-
 .. autoclass:: sentry_sdk.Scope
     :members:
 

sentry_sdk/__init__.py

@@ -7,7 +7,6 @@
 from sentry_sdk.consts import VERSION  # noqa
 
 __all__ = [  # noqa
-    "Hub",
     "Scope",
     "Client",
     "Transport",
@@ -50,6 +49,3 @@
 
 init_debug_support()
 del init_debug_support
-
-# circular imports
-from sentry_sdk.hub import Hub