docs: require Rails releases for Ruby SDK changes

[dustinbyrne]

💡 Motivation and Context

posthog-rails pins an exact core SDK version. Independent releases without a Rails changeset for core updates leave Rails users behind on the Ruby SDK.

Update RELEASING.md to require both packages in changesets for releasable Ruby changes, with a Rails patch bump for dependency-only updates. Rails-only changes need only a Rails changeset. Package version numbers remain independent, and the guide explicitly states that contributors must select Rails because the release tooling does not propagate the bump automatically.

💚 How did you test it?

• git diff --check: passed.
• Checked the guidance against the Changesets package metadata, version-sync script, Rails gemspec, and release workflow.
• Fresh, read-only review: no findings.

📝 Checklist

• I reviewed the submitted changes.
• I updated the docs.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Implemented with pi using Git and GitHub CLI. A fresh, read-only pi reviewer inspected the documentation against the existing release setup and found no issues.

[github-actions]

posthog-ruby-sync Compliance Report

Date: 2026-10-07T18:51:31.616459+00:00
Duration: 94227ms

⚠️ 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	✅	5ms
Format Validation.Event Has Lib Properties	✅	4ms
Format Validation.Distinct Id Is String	✅	8ms
Format Validation.Token Is Present	✅	7ms
Format Validation.Custom Properties Preserved	✅	5ms
Format Validation.Event Has Timestamp	✅	6ms
Format Validation.Non Utc Event Timestamp Is Converted To Utc	✅	5ms
Retry Behavior.Retries On 503	✅	5321ms
Retry Behavior.Does Not Retry On 400	✅	2007ms
Retry Behavior.Does Not Retry On 401	✅	2010ms
Retry Behavior.Respects Retry After Header	✅	8014ms
Retry Behavior.Implements Backoff	✅	15387ms
Retry Behavior.Retries On 500	✅	5162ms
Retry Behavior.Retries On 502	✅	5114ms
Retry Behavior.Retries On 504	✅	5114ms
Retry Behavior.Max Retries Respected	✅	15650ms
Deduplication.Generates Unique Uuids	✅	20ms
Deduplication.Preserves Uuid On Retry	✅	5159ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10300ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5156ms
Deduplication.No Duplicate Events In Batch	✅	15ms
Deduplication.Different Events Have Different Uuids	✅	6ms
Compression.Sends Gzip When Enabled	✅	5ms
Batch Format.Uses Proper Batch Structure	✅	6ms
Batch Format.Flush With No Events Sends Nothing	✅	2ms
Batch Format.Multiple Events Batched Together	❌	13ms
Error Handling.Does Not Retry On 403	✅	2007ms
Error Handling.Does Not Retry On 413	✅	2009ms
Error Handling.Retries On 408	✅	5139ms

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	✅	8ms
Request Payload.Flags Request Uses V2 Query Param	✅	7ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	7ms
Request Payload.Flags Request Omits Authorization Header	✅	7ms
Request Payload.Token In Flags Body Matches Init	✅	5ms
Request Payload.Groups Round Trip	✅	5ms
Request Payload.Groups Default To Empty Object	✅	5ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	5ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	5ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	5ms
Request Lifecycle.No Flags Request On Init Alone	✅	2ms
Request Lifecycle.No Flags Request On Normal Capture	✅	5ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	7ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	6ms
Retry Behavior.Retries Flags On 502	✅	108ms
Retry Behavior.Retries Flags On 504	✅	146ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	6ms

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: 2026-10-07T18:51:17.151118+00:00
Duration: 98352ms

⚠️ 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	✅	109ms
Format Validation.Event Has Uuid	✅	107ms
Format Validation.Event Has Lib Properties	✅	110ms
Format Validation.Distinct Id Is String	✅	106ms
Format Validation.Token Is Present	✅	108ms
Format Validation.Custom Properties Preserved	✅	107ms
Format Validation.Event Has Timestamp	✅	108ms
Format Validation.Non Utc Event Timestamp Is Converted To Utc	✅	10ms
Retry Behavior.Retries On 503	✅	5310ms
Retry Behavior.Does Not Retry On 400	✅	2110ms
Retry Behavior.Does Not Retry On 401	✅	2109ms
Retry Behavior.Respects Retry After Header	✅	8017ms
Retry Behavior.Implements Backoff	✅	15612ms
Retry Behavior.Retries On 500	✅	5212ms
Retry Behavior.Retries On 502	✅	5213ms
Retry Behavior.Retries On 504	✅	5212ms
Retry Behavior.Max Retries Respected	✅	15623ms
Deduplication.Generates Unique Uuids	✅	111ms
Deduplication.Preserves Uuid On Retry	✅	5214ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10419ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5218ms
Deduplication.No Duplicate Events In Batch	✅	114ms
Deduplication.Different Events Have Different Uuids	✅	107ms
Compression.Sends Gzip When Enabled	✅	106ms
Batch Format.Uses Proper Batch Structure	✅	107ms
Batch Format.Flush With No Events Sends Nothing	✅	4ms
Batch Format.Multiple Events Batched Together	✅	112ms
Error Handling.Does Not Retry On 403	✅	2107ms
Error Handling.Does Not Retry On 413	✅	2110ms
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	✅	109ms
Request Payload.Flags Request Uses V2 Query Param	✅	108ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	108ms
Request Payload.Flags Request Omits Authorization Header	✅	110ms
Request Payload.Token In Flags Body Matches Init	✅	109ms
Request Payload.Groups Round Trip	✅	110ms
Request Payload.Groups Default To Empty Object	✅	108ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	108ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	108ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	108ms
Request Lifecycle.No Flags Request On Init Alone	✅	4ms
Request Lifecycle.No Flags Request On Normal Capture	✅	106ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	113ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	109ms
Retry Behavior.Retries Flags On 502	✅	212ms
Retry Behavior.Retries Flags On 504	✅	211ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	110ms

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']

[greptile-apps]

[Low risk] Updates release process documentation for Ruby SDK.

Safe to merge, with a non-blocking suggestion to qualify the Rails patch guidance for breaking SDK updates.

_{Reviews (1) · Last reviewed commit: "docs: require Rails releases for Ruby SD..." · Reviewed by Greptile}