ext_proc: document session affinity configuration - #46558
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Signed-off-by: Dhi Aurrahman <dio@rockybars.com>
dio
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mattklein123,
tyxia,
yanavlasov and
yanjunxiang-google
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August 6, 2026 07:34
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Commit Message: ext_proc: document session affinity configuration
Additional Description: Documents the existing configuration path for keeping requests with the same session key on one external processor endpoint. The downstream key is copied into Envoy gRPC initial metadata and used by a matching cluster-level hash policy. Adds integration coverage for header affinity, passive-cookie affinity, and requests without an affinity key.
No production behavior changes are introduced. A runnable Go demonstration is available at https://github.com/dio/ext-proc-session-affinity.
AI assistance was used to help prepare the documentation and tests; the submitter reviewed and validated the resulting change.
Risk Level: Low
Testing: Focused ext_proc integration test. The runnable demo also measured header and passive-cookie affinity across 32 sessions and 160 requests per mode, with both processor endpoints observed and zero affinity violations.
Docs Changes: Adds ext_proc session-affinity configuration guidance and examples.
Release Notes: N/A
Platform Specific Features: N/A
Fixes #46159