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Unreleased

1.13.1

Patch Changes

  • 541b82f: Include group context in the $feature_flag_called LRU dedupe key so group-scoped flags fire a separate event for each group a user is evaluated under, instead of being dedup-ed against the first group context the same (distinct_id, flag, device_id) was seen under.

1.13.0

Minor Changes

  • dec8ade: Add opt-in panic capture for request context middleware.
  • dec8ade: Add server-side request context helpers for net/http capture and exception events, plus EvaluateFlagsWithContext for using request-scoped distinct IDs during flag evaluation. Request-context flag evaluation does not generate personless IDs.

1.12.6

Patch Changes

  • 9289d53: Reject semver values with leading zeros in local flag evaluation. Per semver 2.0.0 §2, numeric identifiers must not include leading zeros — values like 1.07.3 are not valid semver and should not match targeting conditions. Both override values and flag values are now validated; invalid inputs surface an InconclusiveMatchError so the condition does not match.

1.12.5

Patch Changes

  • 6d243a6: Return ErrSDKDisabled from no-op clients when the project API key is missing, return ErrNoPersonalAPIKey before making requests for Personal API key dependent methods when no Personal API key is configured, and return ErrNoDistinctID from EvaluateFlags when distinct_id is missing.

New Features

  • EvaluateFlags: New method on Client that returns a FeatureFlagEvaluations snapshot for a user using a single /flags request. The snapshot powers any number of IsEnabled / GetFlag / GetFlagPayload checks, fires deduped $feature_flag_called events with full v4 metadata (id, version, reason, request_id), and can be attached to a Capture event via the new Capture.Flags field to populate $feature/<key> and $active_feature_flags without another network call.
  • Capture.Flags: New optional field on Capture that accepts a *FeatureFlagEvaluations snapshot. Takes precedence over SendFeatureFlags, avoids a hidden /flags request per event, and lets caller-supplied Properties override the auto-generated $feature/<key> values on conflict.

Internal

  • Refactored the $feature_flag_called dedup logic into a shared helper so the existing single-flag path and the new snapshot path use identical semantics against the same per-distinct_id LRU cache.
  • $feature_flag_called events from the snapshot path combine response-level errors (errors_while_computing_flags, quota_limited) with per-flag errors (flag_missing) comma-joined in $feature_flag_error, matching the granularity of the legacy single-flag path.

1.12.4 - 2026-04-30

1.12.3 - 2026-04-21

1.12.2 - 2026-04-20

1.12.1 - 2026-04-20

1.12.0 - 2026-04-20

1.11.3 - 2026-04-14

  • Full Changelog

  • Added locally_evaluated property to $feature_flag_called events, indicating whether the flag was evaluated locally or via the remote /flags endpoint.

1.11.2 - 2026-03-26

1.11.1 - 2026-03-11

1.10.0 - 2026-02-04

New Features

  • GetFeatureFlagResult: New method that returns both the flag value and payload in a single call, while properly tracking feature flag usage via $feature_flag_called events.

Deprecations

  • GetFeatureFlagPayload: Deprecated in favor of GetFeatureFlagResult. The new method provides better tracking and a more convenient API.

Migration Guide

// Before (two calls, no event tracking for payload-only):
flag, _ := client.GetFeatureFlag(payload)
payloadStr, _ := client.GetFeatureFlagPayload(payload)

// After (single call, always tracks):
result, err := client.GetFeatureFlagResult(payload)
if err != nil { /* handle */ }
if result.Enabled {
    var config MyConfig
    result.GetPayloadAs(&config)
}

Note: GetFeatureFlagResult returns nil, error when a flag doesn't exist (rather than a result with Enabled: false). Check for errors to distinguish between a disabled flag and a missing flag:

result, err := client.GetFeatureFlagResult(payload)
if errors.Is(err, posthog.ErrFlagNotFound) {
    // Flag doesn't exist - use default behavior
}
if err != nil {
    // Other error (e.g., network issue)
}
if result.Enabled {
    // Flag exists and is enabled
} else {
    // Flag exists but is disabled
}

1.9.1 - 2026-01-21

1.9.0 - 2026-01-13

1.8.2

1.8.1

1.8.0

1.7.0

1.6.13

1.6.12

1.6.11

1.6.10

1.6.9

1.6.8

1.6.7

1.6.6

1.6.5

1.6.4

1.6.3

1.6.2

1.6.1

1.5.15

1.5.14

1.5.13

1.5.12

1.5.11

1.5.10

1.5.9

1.5.8

1.5.7

1.5.6

1.5.5

1.5.4

1.5.3

1.5.2

1.5.1

1.4.10

1.4.9

1.4.8

1.4.7

1.4.6

1.4.5

1.4.4

1.4.3

1.4.2

1.4.1

1.4.0

1.3.3

1.3.2

1.3.1

1.2.24

1.2.23

1.2.22

1.2.21

1.2.20

1.2.19

1.2.18

1.2.17

1.2.16

1.2.15

1.2.14

1.2.13

1.2.12

1.2.11

1.2.10

1.2.9

1.2.8

1.2.7

1.2.6

1.2.5

1.2.4

1.2.3

Changelog

1.2.2 - 2024-08-08

  1. Adds logging to error responses from the PostHog API so that users can see how a call failed (e.g. rate limiting) from the SDK itself.
  2. Better string formatting in poller.Errorf

1.2.1 - 2024-08-07

  1. The client will fall back to the /decide endpoint when evaluating feature flags if the user does not wish to provide a PersonalApiKey. This fixes an issue where users were unable to use this SDK without providing a PersonalApiKey. This fallback will make feature flag usage less performant, but will save users money by not making them pay for public API access.

1.2.0 - 2022-08-15

Breaking changes:

  1. Minimum PostHog version requirement: 1.38
  2. Local Evaluation added to IsFeatureEnabled and GetFeatureFlag. These functions now accept person and group properties arguments. The arguments will be used to locally evaluate relevant feature flags.
  3. Feature flag functions take a payload called FeatureFlagPayload when a key is require and FeatureFlagPayloadNoKey when a key is not required. The payload will handle defaults for all unspecified arguments automatically.
  4. Feature Flag defaults have been removed. If the flag fails for any reason, nil will be returned.
  5. GetAllFlags argument added. This function returns all flags related to the id.
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