current.yaml

date: Pending

behavior_changes:
# *Changes that are expected to cause an incompatibility if applicable; deployment changes are likely required*
- area: http
  change: |
    Envoy no longer adds ``content-length: 0`` header when proxying UPGRADE requests without ``content-length`` and ``transfer-encoding`` headers.
    This behavior change can be reverted by setting the ``envoy.reloadable_features.http_skip_adding_content_length_to_upgrade`` runtime flag to false.

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

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

removed_config_or_runtime:
# *Normally occurs at the end of the* :ref:`deprecation period <deprecated>`
- area: http
  change: |
    removed ``envoy.reloadable_features.proxy_120_103`` and legacy code paths.

- area: lightstep
  change: |
    removed the Lightstep tracer integration, making way for the native OpenTelemetry integration.

new_features:
- area: dns_resolver
  change: |
    added DNS stats for c-ares DNS resolver. Detailed documentation is available :ref:`here <arch_overview_dns_resolution>`.
- area: listener
  change: |
    added multiple listening addresses in single listener. :ref:`listener additional addresses<envoy_v3_api_field_config.listener.v3.Listener.additional_addresses>`.
- area: upstream
  change: |
    added a filter state object to control the destination address in :ref:`ORIGINAL_DST clusters <arch_overview_load_balancing_types_original_destination_request_header_filter_state>`.

deprecated: