chore(capture): v1 compliance adapter + CI job (capture v1, 5/6)

[eli-r-ph]

💡 Motivation and Context

Fifth PR in the stacked Capture V1 series (stacked on #704). This is the one that proves the v1 implementation against the cross-SDK conformance harness: it teaches the compliance adapter to speak capture-v1 and adds a CI job that runs the harness capture_v1 suite against it. Mirrors the posthog-go adapter at the same harness pin.

Adapter (sdk_compliance_adapter/adapter.py):

• Protocol selected by CAPTURE_MODE (baked into a new Dockerfile.v1). One adapter process speaks one mode: /health advertises capture_v1 vs capture_v0, and /init creates the Client with the matching capture_mode. The harness uses the advertised capability to pick which suite to run.
• /init now accepts disable_geoip and historical_migration.
• /capture folds the harness's v1 options back into the SDK's $-prefixed sentinel properties (cookieless_mode -> $cookieless_mode, disable_skew_correction -> $ignore_sent_at, etc.), so the SDK lifts them onto the wire options object — exercising the feat(capture): v1 wire serialization transforms (capture v1, 2/6) #702 transform end to end.
• A patched post_v1 records v1 attempts for /state (retry attempt read from the call, only terminal/non-retry per-event results counted as sent), mirroring the existing patched_batch_post.

CI (.github/workflows/sdk-compliance.yml):

• Bumps the harness pin from the stale main SHA (a v0.5.2-era contract, predating the capture_v1 suites) to 0.8.0 (be8b8d5).
• Splits into two jobs: compliance (v0, Dockerfile) and compliance-v1 (v1, Dockerfile.v1), each with its own report artifact.
• docker-compose.yml gains a sdk-adapter-v1 service and pins the harness image to 0.8.0 for local runs.

💚 How did you test it?

ruff format/check clean; py_compile clean on the adapter. The v0 path is behavior-preserving — capture_mode="v0" resolves identically to the prior implicit default, and disable_geoip/historical_migration keep their previous effective defaults — so the existing v0 suite should pass unchanged at the new pin.

The harness integration itself is validated by the two CI jobs this PR adds (the multi-container harness orchestration is exactly what the reusable workflow runs per job). The adapter is a direct port of the posthog-go v1 adapter, which already passes the capture_v1 suite at this same pin.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change (adapter/CI only; v0 path preserved).

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Authored with Cursor (Claude Opus 4.8) per the agreed plan. The v1 suite asserts against the mock server's recorded requests rather than /state, so the adapter's /state tracking for v1 is best-effort parity with v0 (and with posthog-go) rather than load-bearing for the v1 assertions. Local harness runs were not performed — the added CI jobs are the gate, matching how the harness is intended to be exercised.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "chore(capture): add v1 compliance adapte..." | Re-trigger Greptile}

[github-actions]

posthog-python Compliance Report

Date: 2026-06-28 00:51:59 UTC
Duration: 327284ms

✅ All Tests Passed!

110/110 tests passed

---

Capture_V1 Tests

✅ 94/94 tests passed

View Details

Test	Status	Duration
Endpoint And Method.Targets V1 Endpoint	✅	515ms
Endpoint And Method.Does Not Use Legacy Endpoints	✅	1009ms
Required Headers.Has Authorization Bearer Header	✅	1008ms
Required Headers.Has Content Type Json	✅	1008ms
Required Headers.Has Posthog Sdk Info Format	✅	1008ms
Required Headers.Has Posthog Attempt Header	✅	1008ms
Required Headers.Has Posthog Request Id	✅	1009ms
Required Headers.Has Posthog Request Timestamp	✅	1009ms
Required Headers.Has User Agent	✅	1008ms
Body Format.Body Has Created At And Batch	✅	1008ms
Body Format.No Api Key In Body	✅	1008ms
Body Format.No Sent At In Body	✅	1008ms
Event Format.Event Has Required Root Fields	✅	1009ms
Event Format.Event Uuid Is Valid	✅	1007ms
Event Format.Event Timestamp Is Rfc3339	✅	1009ms
Event Format.Distinct Id Is String	✅	1009ms
Event Format.Distinct Id At Root Not Properties	✅	1009ms
Event Format.Custom Properties Preserved	✅	1008ms
Event Format.Set Properties Preserved	✅	1009ms
Event Format.Set Once Properties Preserved	✅	1008ms
Event Format.Groups Properties Preserved	✅	1009ms
Event Format.Sdk Generates Uuid If Not Provided	✅	1008ms
Event Format.Event Has Required Root Fields Batch	✅	1012ms
Event Format.Event Uuid Is Valid Batch	✅	1012ms
Event Format.Event Timestamp Is Rfc3339 Batch	✅	1011ms
Event Format.Distinct Id Is String Batch	✅	1011ms
Event Format.Distinct Id At Root Not Properties Batch	✅	1012ms
Event Format.Custom Properties Preserved Batch	✅	1012ms
Event Format.Set Properties Preserved Batch	✅	1012ms
Event Format.Set Once Properties Preserved Batch	✅	1012ms
Event Format.Groups Properties Preserved Batch	✅	1011ms
Event Format.Sdk Generates Uuid If Not Provided Batch	✅	1012ms
Batch Behavior.Multiple Events In Single Batch	✅	1506ms
Batch Behavior.Batch Envelope Smoke	✅	1015ms
Batch Behavior.Flush With No Events Sends Nothing	✅	1004ms
Batch Behavior.Flush At Triggers Batch	✅	1508ms
Batch Behavior.Created At Reflects Batch Creation Time	✅	1011ms
Deduplication.Generates Unique Uuids	✅	1506ms
Deduplication.Different Events Same Content Different Uuids	✅	1507ms
Deduplication.Preserves Uuid On Retry	✅	7515ms
Deduplication.Preserves Timestamp On Retry	✅	7511ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	7510ms
Deduplication.No Duplicate Events In Batch	✅	1503ms
Header Behavior On Retry.Attempt Header Starts At One	✅	1008ms
Header Behavior On Retry.Attempt Header Increments On Retry	✅	13519ms
Header Behavior On Retry.Request Id Preserved On Retry	✅	7512ms
Header Behavior On Retry.Different Requests Have Different Request Ids	✅	3514ms
Header Behavior On Retry.Request Timestamp Changes On Retry	✅	7509ms
Response Format Validation.Success Response Has Uuid Keyed Results	✅	1010ms
Response Format Validation.Success Response Has Ok For Each Event	✅	1506ms
Response Format Validation.Success No Retry After When All Ok	✅	1507ms
Response Format Validation.Success Retry After Present When Retry Events	✅	2510ms
Response Format Validation.Success No Retry After When Drop Only	✅	1507ms
Response Format Validation.Response Echoes Request Id	✅	1008ms
Retry Behavior.Retries On 408	✅	7511ms
Retry Behavior.Retries On 500	✅	7514ms
Retry Behavior.Retries On 503	✅	8514ms
Retry Behavior.Retries On 504	✅	7514ms
Retry Behavior.Retryable Errors Have Retry After	✅	4507ms
Retry Behavior.Respects Retry After On Retryable Error	✅	12518ms
Retry Behavior.Does Not Retry On 400	✅	3503ms
Retry Behavior.Does Not Retry On 401	✅	3506ms
Retry Behavior.Does Not Retry On 402	✅	3508ms
Retry Behavior.Does Not Retry On 413	✅	3507ms
Retry Behavior.Does Not Retry On 415	✅	3507ms
Retry Behavior.Non Retryable Errors Have No Retry After	✅	3507ms
Retry Behavior.Implements Backoff	✅	19518ms
Retry Behavior.Max Retries Respected	✅	19519ms
Partial Batch Handling.Handles 200 Full Success	✅	2512ms
Partial Batch Handling.Handles 200 With All Ok	✅	4505ms
Partial Batch Handling.Does Not Retry Dropped Events	✅	4509ms
Partial Batch Handling.Does Not Retry Limited Events	✅	4509ms
Partial Batch Handling.Prunes Ok Events On Partial Retry	✅	7508ms
Partial Batch Handling.Prunes Dropped Events On Partial Retry	✅	7515ms
Partial Batch Handling.Retries Only Retry Events From Partial	✅	7513ms
Partial Batch Handling.Partial Retry Preserves Uuids	✅	7506ms
Partial Batch Handling.Partial Retry Attempt Header Increments	✅	7511ms
Partial Batch Handling.Partial Retry Request Id Preserved	✅	7515ms
Partial Batch Handling.Respects Retry After On Partial	✅	9506ms
Partial Batch Handling.Unknown Result Treated As Terminal	✅	4510ms
Partial Batch Handling.Mixed Ok Drop Limited No Retry	✅	4504ms
Compression.Sends Gzip Content Encoding	✅	1009ms
Compression.No Content Encoding When Disabled	✅	1008ms
Compression.Compressed Body Is Decompressible	✅	1008ms
Error Handling.Does Not Retry On Unknown 4Xx	✅	3507ms
Event Options.Cookieless Mode Override	✅	1007ms
Event Options.Disable Skew Correction Override	✅	1008ms
Event Options.Process Person Profile Override	✅	1008ms
Event Options.Product Tour Id Override	✅	1008ms
Event Options.Unset Options Omitted	✅	1007ms
Event Options.Options Override In Batch	✅	1012ms
Geoip And Historical Migration.Geoip Disable Injected Into Properties	✅	1008ms
Geoip And Historical Migration.Historical Migration Set In Body	✅	1007ms
Geoip And Historical Migration.Historical Migration Absent By Default	✅	1008ms

Feature_Flags Tests

✅ 16/16 tests passed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	1006ms
Request Payload.Flags Request Uses V2 Query Param	✅	1006ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	1006ms
Request Payload.Flags Request Omits Authorization Header	✅	1006ms
Request Payload.Token In Flags Body Matches Init	✅	1005ms
Request Payload.Groups Round Trip	✅	1006ms
Request Payload.Groups Default To Empty Object	✅	1006ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	✅	1006ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	1005ms
Request Payload.Disable Geoip Omitted Defaults To False	✅	1007ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	1005ms
Request Lifecycle.No Flags Request On Init Alone	✅	503ms
Request Lifecycle.No Flags Request On Normal Capture	✅	1506ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	1010ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	1003ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	1509ms