feat(replay): add experiment context to the session replays player by mp-hog · Pull Request #69942 · PostHog/posthog

mp-hog · 2026-07-10T10:52:10Z

Problem

Replays can be opened from Experiments (per-variant "View recordings"), but once you land in the player all experiment context is gone

It should be clear what variant the session you're watching actually saw.
There is no way to jump to the exposure to the experiment, which is a key point in watching experiment replays.

Changes

Everything user-visible is behind a new replay-experiment-context feature flag - the player is unchanged until it's flipped.

New endpoint GET /api/projects/:id/experiments/session_context/?session_id=... resolves which launched experiments (and variants) a session recording saw. It merges $feature_flag_called exposure events with stamped $feature/<key> properties (covers the posthog-js dedupe gap where a returning user's session has no exposure event), flags sessions that saw multiple variants of one flag, only counts the flag's defined variant keys (a non-enrolled user's $feature_flag_response: false never surfaces as a variant), and fast-paths to empty without touching ClickHouse when no launched experiment's run window overlaps the recording. Query/merge logic lives in products/experiments/backend/session_context.py. Requires experiment:read + session_recording:read, respects per-experiment access controls, is ClickHouse-throttled, and bounds the exposure query to real experiment flag keys/variants.
Player chip: variant tags in the player top bar (capped at 2 + overflow), with a warning state when the session saw multiple variants. Click opens the overview sidebar.
Player sidebar, overview section: one row per experiment with a link to the experiment, the variant tag, and a "Jump to variant assignment" seek button (or a "carried over from an earlier session" note when there's no in-session flag evaluation). Clicking the experiment link fires a replay→experiments cross-sell product intent.
Inspector + seekbar markers: a synthesized experiment-variant inspector item per experiment at the flag-evaluation moment, rendered as a clickable seekbar tick.

All copy deliberately says the session saw a variant, and the marker is named after flag evaluation, never "exposure" – flag evaluation only coincides with an experiment's exposure moment for default-exposure experiments (custom exposure configs, holdouts and the run window all differ). The variant itself always comes from the flag, so it's correct for custom-exposure experiments too.

(Known adjacent debt, deliberately untouched: the Max replay tools in products/experiments/backend/max_tools.py re-implement session→experiment filtering in Python with $feature_flag_called hardcoded, ignoring custom exposure configs. They could be ported to this endpoint as a follow-up)

Screenshots:

Player (tag and sidebar)	Inspector

Playback item	Multivariat

How did you test this code?

Manually against seeded data + behind feature flag for follow-up test with production data. Both ClickHouse queries were also sanity-checked read-only against production sessions (which is how the false-variant bug was caught).
products/experiments/backend/test/test_session_context_api.py (14 tests, run against real Postgres + ClickHouse): endpoint contract (400 without session_id, 404 for missing recordings), variant resolution from exposure events and from stamped properties (regression: dropping either source silently loses context for returning users), non-enrollment flag responses ignored (regression: false surfacing as a variant), multi-variant detection, non-experiment flags excluded from results, run-window overlap fast path, and team isolation (another team's recording 404s, another team's experiments never appear – the IDOR case), plus authorization (scope, replay access, private experiments) and non-experiment-flag noise cases.
sessionRecordingExperimentContextLogic.test.ts (3 tests): selector derivation from the response, empty response ⇒ no context, and no fetch when the feature flag is off (pins the dark-launch guarantee).
playerInspectorLogic.test.ts (2 new tests): a timestamped context item yields exactly one experiment-variant inspector item and one seekbar tick while a null-timestamp item yields none, and flag off yields no markers.
Full typescript:check, frontend format, ruff, hogli ci:preflight --fix, and an OpenAPI drift check (regenerated output identical to committed) all clean. (Review-feedback commits verified with ruff, preflight, and CI.)

Automatic notifications

Publish to changelog?
Alert Sales and Marketing teams?

Docs update

None yet – the feature is dark behind the replay-experiment-context flag; docs should land with the flag rollout.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Built by Claude (PostHog Code cloud task) from a detailed human-written implementation plan; the agent re-verified every file/line anchor against master before writing code and implemented in one commit per phase (endpoint → chip/overview → markers).
Skills invoked: /improving-drf-endpoints, /writing-tests, /adopting-generated-api-types, /writing-kea-logics.
Notable decision: the plan offered two options for the seekbar wiring and preferred modelling the marker as an event item, but that conflicts with the plan's own requirement of a distinct item type with a custom label (seekbarItems filters by item.type), so the agent took the plan's explicitly-allowed alternative – widening the seekbarItems filter and PlayerSeekbarTicks prop types.
The sandbox had no database services, so the agent stood up local Postgres, Redis and ClickHouse (with embedded keeper) to run the backend test suite for real rather than deferring to CI.

Created with PostHog Code

…eriment variants GET /api/projects/:id/experiments/session_context/?session_id=... returns which launched experiments (and variants) a session recording saw, merging $feature_flag_called exposure events with stamped $feature/<key> properties to cover the SDK dedupe gap. Includes generated TS/MCP client types. Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

Behind the replay-experiment-context flag: a kea logic fetches the session's experiment context from the new session_context endpoint once per recording, drives variant tags in the player top bar (with a multi-variant warning state) and an Experiments section in the overview sidebar with a jump-to-variant- assignment seek and an experiments cross-sell product intent. Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

Synthesizes an 'experiment-variant' inspector item per experiment the session saw, positioned at the flag-evaluation moment from the session context, and widens the seekbar tick types so the markers render as clickable ticks. Items without an in-session flag evaluation produce no marker. Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

github-actions · 2026-07-10T10:56:32Z

🤖 CI report

⚠️

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⚠️

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✅ Playwright — all passed

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trunk-io · 2026-07-10T11:13:24Z

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posthog · 2026-07-10T12:35:54Z

👋 Visual changes detected for this PR.

Review and approve in PostHog Visual Review

If these changes are unexpected, they may be caused by a flaky test or a broken snapshot on master. Don't approve — rerun the job or wait for a fix.

…text Review feedback fixes: - Filter observed variant values to the flag's defined multivariate variant keys, mirroring the variant IN filter in build_common_exposure_conditions. Without this, a non-enrolled user's `$feature_flag_called` event (`$feature_flag_response: false`) surfaced as a bogus variant named "false". Verified against production data. Regression test added. - Replace the test-tube emoji in the player meta chip with IconFlask, the experiments product icon (matches the inspector row icon). - Clarify that the inspector variant-assignment marker is synthesized client-side from the session_context response, not a backend event. Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

github-actions · 2026-07-10T21:41:37Z

🦔 Hogbox preview · ❌ build failed

The preview didn't come up for commit 149fdbe. See the build log for the failing step. It'll retry on the next push.

greptile-apps · 2026-07-10T21:43:57Z

_{Reviews (1): Last reviewed commit: "fix(experiments): only surface defined v..." | Re-trigger Greptile}

veria-ai · 2026-07-10T21:59:35Z

PR overview

All previously flagged issues have been addressed. No open security concerns remain on this pull request.

Security review

No open security issues remain on this pull request.

Fixed/addressed: 3 · PR risk: 0/10

Addresses two review-bot findings: - The candidate experiment cap (50) could silently and nondeterministically drop matching experiments — the unordered queryset slice happened before checking which flags the session saw. Now the exposure-events query runs unfiltered first, so any flag the session verifiably called rescues its experiment past the cap; the cap only bounds the stamped-property query's column width and slices newest-first for determinism. Verified against production data (the cap is exceeded on real projects today; the capped query performs fine at full width). - Feature flags can arrive after the player mounts, and the loader only checked the flag once in afterMount. A kea subscription on a derived enabled selector now retries the load when the gate flips on (same shape as maxWebAnalyticsNudgeLogic's subscription + afterMount evaluation). Regression tests for both. Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

Address review findings on the session_context endpoint: - Filter candidate experiments through the caller's object-level access controls, so private experiments no longer leak into another user's session context (the queryset is passed from the view, matching how list-action ACL filtering behaves). - Require session_recording:read alongside experiment:read and gate the action on resource-level session replay access, following the replay_vision precedent for endpoints reading recording-derived data. - Apply the ClickHouse burst/sustained throttles the replay API uses, since unknown session ids fall back to an unbounded metadata scan. - Recompute the stamped-property flag keys after exposure-rescued experiments are added, so their stamped variants count toward variants_seen. Generated-By: PostHog Code Task-Id: 4d51e451-ecb1-408a-b405-19b4ec00f7dd

…config Filter the $feature_flag_called exposure query to the overlapping experiments' flag keys and their defined variant names, so its group-by cardinality is bounded by team configuration rather than event payloads. Sessions routinely call plenty of non-experiment flags, and previously those rows competed with real experiment exposures for HogQL's implicit LIMIT 100 (with no ORDER BY), which could silently and nondeterministically drop legitimate exposures in flag-heavy sessions. The key list is built from all overlapping experiments (before the candidate cap) so the beyond-cap rescue keeps working, and the limit is now an explicit generous backstop instead of the implicit 100. Generated-By: PostHog Code Task-Id: 4d51e451-ecb1-408a-b405-19b4ec00f7dd

andehen

Great feature!

Read through the code. Well structured and easy to follow. Decisions looks sound. Focused mostly on the experiment side of things.

One behavior that could be discussed is how the exposure criteria is handled. Right now, it hard codes feature flag called and it does point out that this may differ from how the experiment handles it. We could alternatively here use the experiment exposure criteria (resolve it via the helper) and use that in the query instead.

That said, it is likely not often requested, so I think its fine to wait and rather see if its worth improving later as a follow up.

deployment-status-posthog · 2026-07-13T11:22:08Z

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-07-13 11:21 UTC	Run
prod-us	✅ Deployed	2026-07-13 11:34 UTC	Run
prod-eu	✅ Deployed	2026-07-13 11:36 UTC	Run

mp-hog added 4 commits July 10, 2026 12:20

Merge branch 'master' into posthog-code/replay-experiment-context

f713728

Generated-By: PostHog Code Task-Id: 06b4bcbe-818a-4d7b-bc64-e93038a62451

mp-hog self-assigned this Jul 10, 2026

chore: update OpenAPI generated types

61b881f

mp-hog added the run-ci-frontend Force ci-storybook's full visual-regression matrix to run even on a draft PR label Jul 10, 2026 — with PostHog

mp-hog added 2 commits July 10, 2026 21:39

Fix some texts

3e5cd63

mp-hog marked this pull request as ready for review July 10, 2026 21:41

github-actions Bot deployed to preview-pr-69942 July 10, 2026 21:41 View deployment

pr-assigner-resolver-posthog Bot requested review from a team, TueHaulund, arnohillen, fasyy612 and ksvat and removed request for a team July 10, 2026 21:41

mp-hog changed the title ~~feat(replay): show experiment variant context in the player~~ feat(replay): add experiment context to the session replays player Jul 10, 2026

greptile-apps Bot reviewed Jul 10, 2026

View reviewed changes

Comment thread ...d/src/scenes/session-recordings/player/player-meta/sessionRecordingExperimentContextLogic.ts

Comment thread products/experiments/backend/session_context.py

veria-ai Bot reviewed Jul 10, 2026

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Comment thread products/experiments/backend/presentation/views.py Outdated

Comment thread products/experiments/backend/presentation/views.py

github-actions Bot deployed to preview-pr-69942 July 10, 2026 22:05 View deployment

Merge branch 'master' into posthog-code/replay-experiment-context

266579e

github-actions Bot had a problem deploying to preview-pr-69942 July 13, 2026 05:43 Failure

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mp-hog merged commit 6b810e5 into master Jul 13, 2026
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mp-hog deleted the posthog-code/replay-experiment-context branch July 13, 2026 09:55

This was referenced Jul 13, 2026

feat(experiments): resolve exposure criteria in replay session context #70390

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chore(replay): add storybook stories for experiment context surfaces #70395

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mp-hog mentioned this pull request Jul 15, 2026

feat(sessions): Small UX improvements for experiment player #71341

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mp-hog mentioned this pull request Jul 28, 2026

fix(experiments): enforce per-recording access on session context endpoints #74315

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feat(replay): add experiment context to the session replays player - #69942

feat(replay): add experiment context to the session replays player#69942
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