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@ilrudie ilrudie commented Jan 26, 2026

What this PR does / why we need it:

Align cross-network header key based on chat re:ztunnel PR

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Signed-off-by: Ian Rudie <ian.rudie@solo.io>
@ilrudie ilrudie requested a review from a team as a code owner January 26, 2026 23:24
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😊 Welcome @ilrudie! This is either your first contribution to the Istio proxy repo, or it's been
a while since you've been here.

You can learn more about the Istio working groups, Code of Conduct, and contribution guidelines
by referring to Contributing to Istio.

Thanks for contributing!

Courtesy of your friendly welcome wagon.

@istio-testing istio-testing added the size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. label Jan 26, 2026
@keithmattix keithmattix added the cherrypick/release-1.29 Set this label on a PR to auto-merge it to the release-1.29 branch label Jan 26, 2026
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/retest

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@keithmattix
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/retest

@keithmattix
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Looks like we're hitting a GCP stockout for the nodes that run these test. We'll have to keep trying or provision new compute in a different zone

struct HeaderValues {
const Http::LowerCaseString ExchangeMetadataHeader{"x-envoy-peer-metadata"};
const Http::LowerCaseString ExchangeMetadataHeaderId{"x-envoy-peer-metadata-id"};
const Http::LowerCaseString ExchangeMetadataOriginNetwork{"x-istio-origin-network"};
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should we keep istio here?

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Talking with @ilrudie, I don't think it's actually necessary since we're only using this in the hbone tunnel (vs. things like envoy-peer-metadata that are inserted into the user's http request). We're also using the x- prefix so there's no spec we're violating

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/retest

@istio-testing istio-testing merged commit 4c3823d into istio:master Jan 27, 2026
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In response to a cherrypick label: new pull request created: #6792

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ilrudie commented Jan 27, 2026

Thankyou for babysitting CI @keithmattix ❤️

istio-testing added a commit that referenced this pull request Jan 27, 2026
* Automator: update envoy@ in istio/proxy@master (#6777)

* Automator: update envoy@ in istio/proxy@master (#6778)

* Don't do workload discovery for cross-network traffic (#6767)

* Get the implementation compiling

* Add tests for cross-network peer metadata

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* One more tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Switch to debug for logging

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Automator: update envoy@ in istio/proxy@master (#6782)

* Automator: update envoy@ in istio/proxy@master (#6784)

* Automator: update go-control-plane in istio/proxy@master (#6786)

* Automator: update envoy@ in istio/proxy@master (#6787)

* Automator: update envoy@ in istio/proxy@master (#6788)

* update x-network header key (#6790)

Signed-off-by: Ian Rudie <ian.rudie@solo.io>

* Automator: update envoy@ in istio/proxy@master (#6794)

* Merge upstream/master and resolve merge conflicts

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Missed one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fixed a wrong one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>
istio-testing added a commit that referenced this pull request Jan 28, 2026
* Include myself, Steven and Gustavo as owners of the experimental-ambient-multicluster-telemetry branch (#6772)

* Include myself, Steven and Gustavo as owners of the
experimental-ambient-multicluster-telemetry branch

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Use single match - creating multiple matches means that the later overrides the earlier

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Add Baggage metadata propagation (#6776)

* Add Baggage metadata propagation

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Go back to old baggage impl

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Fix baggage format

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Actually use new baggage approach

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Introduce new filters discovering peer metadata from baggage header (#6771)

* Introduce new filters discovering peer metadata from baggage header

This a combination of two filters that have to be used together:
- regular network filter (expected to be configured in connect_originate
  or inner_connect_originate listeners before TCP Proxy filter)
- upstream network filter (expected to be configuration in all clusters
  that use HBONE or double-HBONE for endpoints)

Those two filters together basically create a tunnel. The tunnel
protocol just prepends a fixed size header to data stream coming from
regular network filter to the upstream network filter, followed by the
peer metadatra encoded as protobuf Any containing a protobuf Struct
inside (I'm just re-using existing code from Istio proxy, that's why
encoding is such as it is).

The regular network filter only triggers when there is some data coming
from upstream connection in response. It's not correct in general, but
in waypoints we do know that we proxy an L7 protocol (http or gRPC), so
we do expect a some data in reply.

The regular network filter relies on TCP Proxy filter extracting
response headers and saving them in the filter state. It then extracts
and parses the baggage header from the saved headers.

In all cases I explicitly communicate when no peer metadata has been
discovered by sending some data downstream. This ensures that upstream
network filter running downstream can always remove the prefix from the
data stream and does not really need to guess if it's there or not.

NOTE: We still do some checks to confirm that the prefix is there, but
we cannot really rely on those checks for correctness in all the cases.

The upstream network filter, as pointed out above, extracts the data
sent by the regular network filter from the data stream, it parses the
data and populates filter state based on that.

Unlike the HTTP peer metadata filter, this one runs in the context of
the upstream connection, so it populates the upstream filter state and
not the regular one.

I plan to add support to the HTTP peer metadata filter option for new
upstream metadata discovery via upstream filter metadata, thus
propagating it all the way to the istio stats filter.

NOTE: None of those filters are yet generated by pilot and there are
certainly some additional options to configure (e.g., maybe we can come
up with a good way to transfer metadata via Envoy TLS instead of
injecting it into the data stream directly - this way, in principle, we
could avoid creating a custom upstream filter all together, if http peer
metadata filter could get the peer metadata directly from
connect_originate listener). All-in-all, it's not the final
implementation.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix BUILD formatting

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix formatting of C++ code

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Update HTTP peer_metadata filter to consume filter state set by upstream
peer_metadata filter

This basically taps the upstream peer metadata into the regular filter
state consumed by the istio stats filter. http peer metadata filter also
takes care of priorities between different discovery methods - we just
need to put different discovery methods in the right order in the
configuration.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Populate peer principal in the upstream workload metadata as well

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Support propagating baggage header to upstream and additional safety checks for upstream network filter

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Only register UpstreamFilterState peer metadata discovery method for upstream peer discovery

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Move peer_metadata filter proto config in the same directory

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix typo

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Baggage discovery (#6779)

* Add Baggage metadata propagation

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* basics for baggage discovery downstream

* removing unnecessary tests

* reverting crazy claude changes in release-binary.sh

* fixing tests, fixing baggage key tokens

* removing comment

* make lint

* fixing unit tests for metadata_object

* make lint

* suggestions from PR

* clarifying use of mappings for baggage and field access

* make lint

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>

* Add locality to proxy metadata (#6780)

* Add locality to proxy metadata

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Buildifier format

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Rebase and fix some bugs

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Drop app labels from baggage and propagate principal (#6791)

* Drop app labels from baggage and propagate principal

I think I confused folks a bit when I mentioned that app field is
missing from the baggage - it wasn't. In fact, canonical name of the
workload and app in ambient are the same thing, that's why baggage does
not actually need an app label - it already has service.name that
encodes what we need.

I updated the design document, but it happened after I mentioned here
and there that we need to add a missing field to the baggage.

This change corrects implementation and that makes istio stats populate
the app label correctly.

The other field that has not been populated is principal.
WorkloadMetadataObject contained that identity field that contained
principle in principle, but the methods used to conver
WorkloadMetadataObject to a protobuf Struct and back ignored that field
and never populated it, so it got lost and istio stats never used it.

We haven't noticed that before because in ambient we used xDS-based
peer metadata discovery by default and it triggers a different code
path that does not rely on the methods that convert protobuf Struct
to WorkloadMetadataObject, and the code path used there didn't have the
same issue.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Keep backwards compatibility for app.service and app.version baggage fields

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>

* Fix some test compilation errors

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Merge master branch and resolve merge conflicts properly (#6795)

* Automator: update envoy@ in istio/proxy@master (#6777)

* Automator: update envoy@ in istio/proxy@master (#6778)

* Don't do workload discovery for cross-network traffic (#6767)

* Get the implementation compiling

* Add tests for cross-network peer metadata

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* One more tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Switch to debug for logging

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Automator: update envoy@ in istio/proxy@master (#6782)

* Automator: update envoy@ in istio/proxy@master (#6784)

* Automator: update go-control-plane in istio/proxy@master (#6786)

* Automator: update envoy@ in istio/proxy@master (#6787)

* Automator: update envoy@ in istio/proxy@master (#6788)

* update x-network header key (#6790)

Signed-off-by: Ian Rudie <ian.rudie@solo.io>

* Automator: update envoy@ in istio/proxy@master (#6794)

* Merge upstream/master and resolve merge conflicts

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Missed one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fixed a wrong one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Co-authored-by: Krinkin, Mike <mkrinkin@microsoft.com>
Co-authored-by: Gustavo Meira <grnmeira@users.noreply.github.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>
keithmattix added a commit to keithmattix/proxy that referenced this pull request Jan 28, 2026
* Include myself, Steven and Gustavo as owners of the experimental-ambient-multicluster-telemetry branch (istio#6772)

* Include myself, Steven and Gustavo as owners of the
experimental-ambient-multicluster-telemetry branch

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Use single match - creating multiple matches means that the later overrides the earlier

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Add Baggage metadata propagation (istio#6776)

* Add Baggage metadata propagation

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Go back to old baggage impl

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Fix baggage format

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Actually use new baggage approach

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Introduce new filters discovering peer metadata from baggage header (istio#6771)

* Introduce new filters discovering peer metadata from baggage header

This a combination of two filters that have to be used together:
- regular network filter (expected to be configured in connect_originate
  or inner_connect_originate listeners before TCP Proxy filter)
- upstream network filter (expected to be configuration in all clusters
  that use HBONE or double-HBONE for endpoints)

Those two filters together basically create a tunnel. The tunnel
protocol just prepends a fixed size header to data stream coming from
regular network filter to the upstream network filter, followed by the
peer metadatra encoded as protobuf Any containing a protobuf Struct
inside (I'm just re-using existing code from Istio proxy, that's why
encoding is such as it is).

The regular network filter only triggers when there is some data coming
from upstream connection in response. It's not correct in general, but
in waypoints we do know that we proxy an L7 protocol (http or gRPC), so
we do expect a some data in reply.

The regular network filter relies on TCP Proxy filter extracting
response headers and saving them in the filter state. It then extracts
and parses the baggage header from the saved headers.

In all cases I explicitly communicate when no peer metadata has been
discovered by sending some data downstream. This ensures that upstream
network filter running downstream can always remove the prefix from the
data stream and does not really need to guess if it's there or not.

NOTE: We still do some checks to confirm that the prefix is there, but
we cannot really rely on those checks for correctness in all the cases.

The upstream network filter, as pointed out above, extracts the data
sent by the regular network filter from the data stream, it parses the
data and populates filter state based on that.

Unlike the HTTP peer metadata filter, this one runs in the context of
the upstream connection, so it populates the upstream filter state and
not the regular one.

I plan to add support to the HTTP peer metadata filter option for new
upstream metadata discovery via upstream filter metadata, thus
propagating it all the way to the istio stats filter.

NOTE: None of those filters are yet generated by pilot and there are
certainly some additional options to configure (e.g., maybe we can come
up with a good way to transfer metadata via Envoy TLS instead of
injecting it into the data stream directly - this way, in principle, we
could avoid creating a custom upstream filter all together, if http peer
metadata filter could get the peer metadata directly from
connect_originate listener). All-in-all, it's not the final
implementation.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix BUILD formatting

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix formatting of C++ code

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Update HTTP peer_metadata filter to consume filter state set by upstream
peer_metadata filter

This basically taps the upstream peer metadata into the regular filter
state consumed by the istio stats filter. http peer metadata filter also
takes care of priorities between different discovery methods - we just
need to put different discovery methods in the right order in the
configuration.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Populate peer principal in the upstream workload metadata as well

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Support propagating baggage header to upstream and additional safety checks for upstream network filter

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Only register UpstreamFilterState peer metadata discovery method for upstream peer discovery

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Move peer_metadata filter proto config in the same directory

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fix typo

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Baggage discovery (istio#6779)

* Add Baggage metadata propagation

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* basics for baggage discovery downstream

* removing unnecessary tests

* reverting crazy claude changes in release-binary.sh

* fixing tests, fixing baggage key tokens

* removing comment

* make lint

* fixing unit tests for metadata_object

* make lint

* suggestions from PR

* clarifying use of mappings for baggage and field access

* make lint

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>

* Add locality to proxy metadata (istio#6780)

* Add locality to proxy metadata

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Buildifier format

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Rebase and fix some bugs

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Drop app labels from baggage and propagate principal (istio#6791)

* Drop app labels from baggage and propagate principal

I think I confused folks a bit when I mentioned that app field is
missing from the baggage - it wasn't. In fact, canonical name of the
workload and app in ambient are the same thing, that's why baggage does
not actually need an app label - it already has service.name that
encodes what we need.

I updated the design document, but it happened after I mentioned here
and there that we need to add a missing field to the baggage.

This change corrects implementation and that makes istio stats populate
the app label correctly.

The other field that has not been populated is principal.
WorkloadMetadataObject contained that identity field that contained
principle in principle, but the methods used to conver
WorkloadMetadataObject to a protobuf Struct and back ignored that field
and never populated it, so it got lost and istio stats never used it.

We haven't noticed that before because in ambient we used xDS-based
peer metadata discovery by default and it triggers a different code
path that does not rely on the methods that convert protobuf Struct
to WorkloadMetadataObject, and the code path used there didn't have the
same issue.

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Keep backwards compatibility for app.service and app.version baggage fields

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>

* Fix some test compilation errors

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Merge master branch and resolve merge conflicts properly (istio#6795)

* Automator: update envoy@ in istio/proxy@master (istio#6777)

* Automator: update envoy@ in istio/proxy@master (istio#6778)

* Don't do workload discovery for cross-network traffic (istio#6767)

* Get the implementation compiling

* Add tests for cross-network peer metadata

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* clang-tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* One more tidy

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Switch to debug for logging

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>

* Automator: update envoy@ in istio/proxy@master (istio#6782)

* Automator: update envoy@ in istio/proxy@master (istio#6784)

* Automator: update go-control-plane in istio/proxy@master (istio#6786)

* Automator: update envoy@ in istio/proxy@master (istio#6787)

* Automator: update envoy@ in istio/proxy@master (istio#6788)

* update x-network header key (istio#6790)

Signed-off-by: Ian Rudie <ian.rudie@solo.io>

* Automator: update envoy@ in istio/proxy@master (istio#6794)

* Merge upstream/master and resolve merge conflicts

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Missed one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

* Fixed a wrong one

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>

---------

Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Keith Mattix II <keithmattix@microsoft.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>

---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Co-authored-by: Krinkin, Mike <mkrinkin@microsoft.com>
Co-authored-by: Gustavo Meira <grnmeira@users.noreply.github.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>
istio-testing added a commit that referenced this pull request Jan 28, 2026
* Include myself, Steven and Gustavo as owners of the experimental-ambient-multicluster-telemetry branch (#6772)

* Include myself, Steven and Gustavo as owners of the
experimental-ambient-multicluster-telemetry branch



* Use single match - creating multiple matches means that the later overrides the earlier



---------



* Add Baggage metadata propagation (#6776)

* Add Baggage metadata propagation



* clang-tidy



* Go back to old baggage impl



* Fix baggage format



* Actually use new baggage approach



---------



* Introduce new filters discovering peer metadata from baggage header (#6771)

* Introduce new filters discovering peer metadata from baggage header

This a combination of two filters that have to be used together:
- regular network filter (expected to be configured in connect_originate
  or inner_connect_originate listeners before TCP Proxy filter)
- upstream network filter (expected to be configuration in all clusters
  that use HBONE or double-HBONE for endpoints)

Those two filters together basically create a tunnel. The tunnel
protocol just prepends a fixed size header to data stream coming from
regular network filter to the upstream network filter, followed by the
peer metadatra encoded as protobuf Any containing a protobuf Struct
inside (I'm just re-using existing code from Istio proxy, that's why
encoding is such as it is).

The regular network filter only triggers when there is some data coming
from upstream connection in response. It's not correct in general, but
in waypoints we do know that we proxy an L7 protocol (http or gRPC), so
we do expect a some data in reply.

The regular network filter relies on TCP Proxy filter extracting
response headers and saving them in the filter state. It then extracts
and parses the baggage header from the saved headers.

In all cases I explicitly communicate when no peer metadata has been
discovered by sending some data downstream. This ensures that upstream
network filter running downstream can always remove the prefix from the
data stream and does not really need to guess if it's there or not.

NOTE: We still do some checks to confirm that the prefix is there, but
we cannot really rely on those checks for correctness in all the cases.

The upstream network filter, as pointed out above, extracts the data
sent by the regular network filter from the data stream, it parses the
data and populates filter state based on that.

Unlike the HTTP peer metadata filter, this one runs in the context of
the upstream connection, so it populates the upstream filter state and
not the regular one.

I plan to add support to the HTTP peer metadata filter option for new
upstream metadata discovery via upstream filter metadata, thus
propagating it all the way to the istio stats filter.

NOTE: None of those filters are yet generated by pilot and there are
certainly some additional options to configure (e.g., maybe we can come
up with a good way to transfer metadata via Envoy TLS instead of
injecting it into the data stream directly - this way, in principle, we
could avoid creating a custom upstream filter all together, if http peer
metadata filter could get the peer metadata directly from
connect_originate listener). All-in-all, it's not the final
implementation.



* Fix BUILD formatting



* Fix formatting of C++ code



* Update HTTP peer_metadata filter to consume filter state set by upstream
peer_metadata filter

This basically taps the upstream peer metadata into the regular filter
state consumed by the istio stats filter. http peer metadata filter also
takes care of priorities between different discovery methods - we just
need to put different discovery methods in the right order in the
configuration.



* Populate peer principal in the upstream workload metadata as well



* Support propagating baggage header to upstream and additional safety checks for upstream network filter



* Only register UpstreamFilterState peer metadata discovery method for upstream peer discovery



* Move peer_metadata filter proto config in the same directory



* Fix typo



---------



* Baggage discovery (#6779)

* Add Baggage metadata propagation



* clang-tidy



* basics for baggage discovery downstream

* removing unnecessary tests

* reverting crazy claude changes in release-binary.sh

* fixing tests, fixing baggage key tokens

* removing comment

* make lint

* fixing unit tests for metadata_object

* make lint

* suggestions from PR

* clarifying use of mappings for baggage and field access

* make lint

---------




* Add locality to proxy metadata (#6780)

* Add locality to proxy metadata



* Clang-tidy



* Buildifier format



* Rebase and fix some bugs



---------



* Drop app labels from baggage and propagate principal (#6791)

* Drop app labels from baggage and propagate principal

I think I confused folks a bit when I mentioned that app field is
missing from the baggage - it wasn't. In fact, canonical name of the
workload and app in ambient are the same thing, that's why baggage does
not actually need an app label - it already has service.name that
encodes what we need.

I updated the design document, but it happened after I mentioned here
and there that we need to add a missing field to the baggage.

This change corrects implementation and that makes istio stats populate
the app label correctly.

The other field that has not been populated is principal.
WorkloadMetadataObject contained that identity field that contained
principle in principle, but the methods used to conver
WorkloadMetadataObject to a protobuf Struct and back ignored that field
and never populated it, so it got lost and istio stats never used it.

We haven't noticed that before because in ambient we used xDS-based
peer metadata discovery by default and it triggers a different code
path that does not rely on the methods that convert protobuf Struct
to WorkloadMetadataObject, and the code path used there didn't have the
same issue.



* Keep backwards compatibility for app.service and app.version baggage fields



---------





* Fix some test compilation errors



* Merge master branch and resolve merge conflicts properly (#6795)

* Automator: update envoy@ in istio/proxy@master (#6777)

* Automator: update envoy@ in istio/proxy@master (#6778)

* Don't do workload discovery for cross-network traffic (#6767)

* Get the implementation compiling

* Add tests for cross-network peer metadata



* clang-tidy



* One more tidy



* Switch to debug for logging



---------



* Automator: update envoy@ in istio/proxy@master (#6782)

* Automator: update envoy@ in istio/proxy@master (#6784)

* Automator: update go-control-plane in istio/proxy@master (#6786)

* Automator: update envoy@ in istio/proxy@master (#6787)

* Automator: update envoy@ in istio/proxy@master (#6788)

* update x-network header key (#6790)



* Automator: update envoy@ in istio/proxy@master (#6794)

* Merge upstream/master and resolve merge conflicts



* Missed one



* Fixed a wrong one



---------








---------

Signed-off-by: Mikhail Krinkin <mkrinkin@microsoft.com>
Signed-off-by: Keith Mattix II <keithmattix@microsoft.com>
Signed-off-by: Ian Rudie <ian.rudie@solo.io>
Co-authored-by: Krinkin, Mike <mkrinkin@microsoft.com>
Co-authored-by: Gustavo Meira <grnmeira@users.noreply.github.com>
Co-authored-by: Istio Automation <istio-testing-bot@google.com>
Co-authored-by: Ian Rudie <ilrudie@gmail.com>
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