.. _version_history_1.31.0:

1.31.0 (Pending)
=================




Incompatible behavior changes
-----------------------------

*Changes that are expected to cause an incompatibility if applicable; deployment changes are likely required*



* **thread_local**: Changes the behavior of the ``SlotImpl`` class destructor. With this change the destructor can be called on any thread.
  This behavior can be reverted by setting the runtime flag ``envoy.reloadable_features.allow_slot_destroy_on_worker_threads``
  to false.



Minor behavior changes
----------------------

*Changes that may cause incompatibilities for some users, but should not for most*



* **tracers**: Set status code for OpenTelemetry tracers (previously unset).



Bug fixes
---------

*Changes expected to improve the state of the world and are unlikely to have negative effects*



* **outlier detection**: Fixed :ref:`successful_active_health_check_uneject_host
  <envoy_v3_api_field_config.cluster.v3.OutlierDetection.successful_active_health_check_uneject_host>`.
  Before, a failed health check could uneject the host if the ``FAILED_ACTIVE_HC`` health flag had not been set.
* **tls**: Fix a RELEASE_ASSERT when using :ref:`auto_sni <envoy_v3_api_field_config.core.v3.UpstreamHttpProtocolOptions.auto_sni>`
  if the downstream request ``:authority`` was longer than 255 characters.



Removed config or runtime
-------------------------

*Normally occurs at the end of the* :ref:`deprecation period <deprecated>`



* **http**: Removed ``envoy.reloadable_features.handle_uppercase_scheme`` runtime flag and legacy code paths.
* **http**: Removed ``envoy.reloadable_features.lowercase_scheme`` runtime flag and lagacy code paths.
* **http**: Removed ``envoy.reloadable_features.proxy_status_upstream_request_timeout`` runtime flag and lagacy code paths.
* **tcp**: Removed ``envoy.reloadable_features.detect_and_raise_rst_tcp_connection`` runtime flag and legacy code paths.



New features
------------


* **matching**: Added :ref:`Filter State Input <envoy_v3_api_msg_extensions.matching.common_inputs.network.v3.FilterStateInput>`
  for matching http input based on filter state objects.