changelogs: Blank release summary (#37733)

Signed-off-by: Ryan Northey <[email protected]>

changelogs/summary.md

@@ -1,14 +1 @@
-**Summary of changes**:
 
-* Envoy now logs warnings when `internal_address_config` is not set.  If you see this logged warning and wish to retain trusted status for internal addresses you must explicitly configure `internal_address_config` (which will turn off the warning) before the next Envoy release.
-* Removed support for (long deprecated) opentracing. 
-* Added a configuration setting for the maximum size of response headers in responses.
-* Added support for `connection_pool_per_downstream_connection` flag in tcp connection pool.
-* For the strict DNS and logical DNS cluster types, the `dns_jitter` field allows spreading out DNS refresh requests
-* Added dynamic metadata matcher support `dynamic metadata input` and `dynamic metadata input matcher`.
-* The xff original IP detection method now supports using a list of trusted CIDRs when parsing `x-forwarded-for`.
-* QUIC server and client support certificate compression, which can in some cases reduce the number of round trips required to setup a connection.
-* Added the ability to monitor CPU utilization in Linux based systems via `cpu utilization monitor` in overload manager.
-* Added new access log command operators (`%START_TIME_LOCAL%` and `%EMIT_TIME_LOCAL%`) formatters (`%UPSTREAM_CLUSTER_RAW%` `%DOWNSTREAM_PEER_CHAIN_FINGERPRINTS_256%`, and `%DOWNSTREAM_PEER_CHAIN_SERIALS%`) as well as significant boosts to json parsing.  See release notes for details
-* Added support for `%BYTES_RECEIVED%`, `%BYTES_SENT%`, `%UPSTREAM_HEADER_BYTES_SENT%`, `%UPSTREAM_HEADER_BYTES_RECEIVED%`, `%UPSTREAM_WIRE_BYTES_SENT%`, `%UPSTREAM_WIRE_BYTES_RECEIVED%` and access log substitution strings for UDP tunneling flows.
-* Added ECDS support for UDP session filters.