ci: cover native Ruby UUIDs and synchronous capture in SDK harness

[dustinbyrne]

💡 Motivation and Context

Exercise Ruby's own UUID generation and synchronous capture transport in the SDK harness, and include the UTC timestamp case from harness 1.0.0 in recurring CI.

• Observe SDK-generated UUIDs through the existing before_send hook; preserve explicitly supplied UUIDs.
• Run separate async and sync_mode profiles with distinct reports. Keep real snapshot flag evaluation and the native omitted GeoIP default.
• Keep assertion failures advisory while requiring both complete 47-case reports.

This changes only the adapter, its tests/documentation and CI. SDK public APIs/defaults and Rails are unchanged; no package release is needed.

💚 How did you test it?

• bundle exec rspec: 696 examples, 0 failures, including 19 adapter examples.
• bundle exec rubocop: 85 files, no offenses.
• bundle exec rake public_api:check: passed.
• Harness 1.0.0 against a locally built Ruby gem on Ruby 3.4.7:

Profile	Selected	Passed	Failed
async	47	46	1
sync	47	45	2

Both profiles expose feature_flags.request_payload.disable_geoip_omitted_defaults_to_false: the SDK omits the field instead of sending literal false. Sync additionally fails capture.batch_format.multiple_events_batched_together because it sends each event immediately. Both profiles pass the UTC and native UUID definitions.

The full suites run without filtering. Sync's batch-retry identity definition passes on a retried single-event request; neither that result nor its multi-event batching failure certifies queue batching. V1, dedicated AI and non-gzip codecs remain unsupported. Existing diagnostic-state limitations are documented in the adapter README.

The inventory check accepts the real reports with these failures and rejects missing/zero-test reports. Docker was unavailable locally; container validation will come from this PR's CI.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

🤖 Agent context

Autonomy: Human-driven (agent-assisted).

Implemented using a Pi coding agent with shell/file tools and GitHub CLI, followed by a fresh read-only agent review. Coverage uses existing public SDK calls and passive observation; wire assertions remain owned by the unchanged harness. Human review is still required.

[github-actions]

posthog-ruby-sync Compliance Report

Date: 2026-09-07T20:16:01.918235+00:00
Duration: 94250ms

⚠️ Some Tests Failed

45/47 tests passed, 2 failed

---

Capture Tests

⚠️ 29/30 tests passed, 1 failed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	8ms
Format Validation.Event Has Uuid	✅	10ms
Format Validation.Event Has Lib Properties	✅	5ms
Format Validation.Distinct Id Is String	✅	9ms
Format Validation.Token Is Present	✅	6ms
Format Validation.Custom Properties Preserved	✅	8ms
Format Validation.Event Has Timestamp	✅	7ms
Format Validation.Non Utc Event Timestamp Is Converted To Utc	✅	6ms
Retry Behavior.Retries On 503	✅	5279ms
Retry Behavior.Does Not Retry On 400	✅	2008ms
Retry Behavior.Does Not Retry On 401	✅	2011ms
Retry Behavior.Respects Retry After Header	✅	8017ms
Retry Behavior.Implements Backoff	✅	15382ms
Retry Behavior.Retries On 500	✅	5157ms
Retry Behavior.Retries On 502	✅	5161ms
Retry Behavior.Retries On 504	✅	5116ms
Retry Behavior.Max Retries Respected	✅	15624ms
Deduplication.Generates Unique Uuids	✅	21ms
Deduplication.Preserves Uuid On Retry	✅	5113ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10314ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5163ms
Deduplication.No Duplicate Events In Batch	✅	21ms
Deduplication.Different Events Have Different Uuids	✅	9ms
Compression.Sends Gzip When Enabled	✅	5ms
Batch Format.Uses Proper Batch Structure	✅	7ms
Batch Format.Flush With No Events Sends Nothing	✅	3ms
Batch Format.Multiple Events Batched Together	❌	16ms
Error Handling.Does Not Retry On 403	✅	2006ms
Error Handling.Does Not Retry On 413	✅	2009ms
Error Handling.Retries On 408	✅	5144ms

Failures

batch_format.multiple_events_batched_together

Expected 1 requests, got 5

Feature_Flags Tests

⚠️ 16/17 tests passed, 1 failed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	9ms
Request Payload.Flags Request Uses V2 Query Param	✅	7ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	10ms
Request Payload.Flags Request Omits Authorization Header	✅	10ms
Request Payload.Token In Flags Body Matches Init	✅	6ms
Request Payload.Groups Round Trip	✅	6ms
Request Payload.Groups Default To Empty Object	✅	6ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	7ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	6ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	6ms
Request Lifecycle.No Flags Request On Init Alone	✅	2ms
Request Lifecycle.No Flags Request On Normal Capture	✅	7ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	11ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	7ms
Retry Behavior.Retries Flags On 502	✅	109ms
Retry Behavior.Retries Flags On 504	✅	111ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	8ms

Failures

request_payload.disable_geoip_omitted_defaults_to_false

Field 'geoip_disable' not found in /flags request body at path 'geoip_disable'. Available keys: ['distinct_id', 'groups', 'person_properties', 'group_properties', 'flag_keys_to_evaluate', 'token']

[github-actions]

posthog-ruby-async Compliance Report

Date: 2026-09-07T20:16:14.576961+00:00
Duration: 98528ms

⚠️ Some Tests Failed

46/47 tests passed, 1 failed

---

Capture Tests

✅ 30/30 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	107ms
Format Validation.Event Has Uuid	✅	107ms
Format Validation.Event Has Lib Properties	✅	108ms
Format Validation.Distinct Id Is String	✅	106ms
Format Validation.Token Is Present	✅	107ms
Format Validation.Custom Properties Preserved	✅	106ms
Format Validation.Event Has Timestamp	✅	106ms
Format Validation.Non Utc Event Timestamp Is Converted To Utc	✅	10ms
Retry Behavior.Retries On 503	✅	5308ms
Retry Behavior.Does Not Retry On 400	✅	2109ms
Retry Behavior.Does Not Retry On 401	✅	2109ms
Retry Behavior.Respects Retry After Header	✅	8115ms
Retry Behavior.Implements Backoff	✅	15622ms
Retry Behavior.Retries On 500	✅	5212ms
Retry Behavior.Retries On 502	✅	5213ms
Retry Behavior.Retries On 504	✅	5212ms
Retry Behavior.Max Retries Respected	✅	15722ms
Deduplication.Generates Unique Uuids	✅	111ms
Deduplication.Preserves Uuid On Retry	✅	5210ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10418ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5216ms
Deduplication.No Duplicate Events In Batch	✅	113ms
Deduplication.Different Events Have Different Uuids	✅	107ms
Compression.Sends Gzip When Enabled	✅	106ms
Batch Format.Uses Proper Batch Structure	✅	106ms
Batch Format.Flush With No Events Sends Nothing	✅	4ms
Batch Format.Multiple Events Batched Together	✅	112ms
Error Handling.Does Not Retry On 403	✅	2108ms
Error Handling.Does Not Retry On 413	✅	2109ms
Error Handling.Retries On 408	✅	5212ms

Feature_Flags Tests

⚠️ 16/17 tests passed, 1 failed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	108ms
Request Payload.Flags Request Uses V2 Query Param	✅	107ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	107ms
Request Payload.Flags Request Omits Authorization Header	✅	108ms
Request Payload.Token In Flags Body Matches Init	✅	108ms
Request Payload.Groups Round Trip	✅	109ms
Request Payload.Groups Default To Empty Object	✅	108ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	106ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	106ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	107ms
Request Lifecycle.No Flags Request On Init Alone	✅	3ms
Request Lifecycle.No Flags Request On Normal Capture	✅	105ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	109ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	106ms
Retry Behavior.Retries Flags On 502	✅	209ms
Retry Behavior.Retries Flags On 504	✅	259ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	108ms

Failures

request_payload.disable_geoip_omitted_defaults_to_false

Field 'geoip_disable' not found in /flags request body at path 'geoip_disable'. Available keys: ['distinct_id', 'groups', 'person_properties', 'group_properties', 'flag_keys_to_evaluate', 'token']