[jurajmajerik]

Problem

Four small rough edges in the experiment view:

• The Save button in the distribution modal disables with no explanation when variant splits don't sum to 100.
• The pencil buttons on the Settings tab (statistics, CUPED) have no tooltip or accessible label.
• The details table formats confidence intervals inline instead of using the shared formatIntervalPercent helper.
• The timeseries tooltip renders "NaN%" or "Infinity%" if a bound is not a finite number.

Changes

• The distribution modal's Save button now shows "Percentage splits must sum to 100" on hover when disabled, matching the editor's inline error copy.
• The Settings tab pencil buttons now have "Edit statistics settings" / "Edit CUPED settings" tooltips and aria-labels.
• The details table uses formatIntervalPercent. Mechanical, output is identical.
• The timeseries tooltip shows "—" for non-finite values, matching formatMetricValue.

How did you test this code?

No logic changes beyond the non-finite guard. No tests reference the touched props or strings. Not run: frontend typecheck and jest (light worktree without node_modules); no screenshots for the same reason. The tooltip and disabled-reason changes use standard LemonButton props.

Automatic notifications

• Publish to changelog?

Docs update

None.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Written with Claude Code. These fixes come from the same experiment-view polish audit as #88216. Skills invoked: /wt, /writing-user-facing-copy, /writing-pr-descriptions (loaded earlier this session).

[trunk-io]

😎 Merged successfully - details.

[github-actions]

🤖 CI report

✅ Trunk lane — non-backend lane

This PR is assigned to the non-backend lane. It does not run backend Python tests and may merge in parallel with PRs in other lanes.

⚠️ Bundle size — 🔺 +69 B (+0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 68.94 MiB · 🔺 +69 B (+0.0%)

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) src/index.tsx	1.36 MiB · 22 files	no change	███░░░░░░░ 30.2% of 4.51 MiB
authenticated shell (every logged-in page) src/scenes/AuthenticatedShell.tsx	8.76 MiB · 3,235 files	no change	█████████░ 90.2% of 9.71 MiB

🟢 node_modules/monaco-editor/ stays out of src/index.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 node_modules/monaco-editor/ stays out of src/scenes/AuthenticatedShell.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx

Largest files eagerly shipped from src/index.tsx

Size	File
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
24.6 KiB	../node_modules/.pnpm/buffer@6.0.3/node_modules/buffer/index.js
6.3 KiB	../node_modules/.pnpm/react@18.3.1/node_modules/react/cjs/react.production.min.js
4.5 KiB	../node_modules/.pnpm/@jspm+core@2.1.0/node_modules/@jspm/core/nodelibs/browser/process.js
3.9 KiB	../node_modules/.pnpm/scheduler@0.23.2/node_modules/scheduler/cjs/scheduler.production.min.js
1.4 KiB	../node_modules/.pnpm/base64-js@1.5.1/node_modules/base64-js/index.js
1.3 KiB	src/RootErrorBoundary.tsx
912 B	../node_modules/.pnpm/ieee754@1.2.1/node_modules/ieee754/index.js
789 B	src/scenes/ChunkLoadErrorBoundary.tsx
762 B	src/index.tsx

Largest files eagerly shipped from src/scenes/AuthenticatedShell.tsx

Size	File
304.9 KiB	../node_modules/.pnpm/posthog-js@1.418.16/node_modules/posthog-js/dist/rrweb.js
267.7 KiB	../node_modules/.pnpm/@posthog+icons@0.38.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
258.5 KiB	../node_modules/.pnpm/posthog-js@1.418.16/node_modules/posthog-js/dist/module.js
246.0 KiB	src/taxonomy/core-filter-definitions-by-group.json
154.2 KiB	../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
104.6 KiB	src/lib/api.ts
95.1 KiB	../packages/quill/packages/quill/dist/index.js
93.3 KiB	../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js
90.6 KiB	../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Toolbar bundle — eager 2.25 MiB within budget

What the toolbar ships to customer pages, measured from the esbuild output (minified, post-tree-shake). The eager set is the entry plus everything statically imported from it — fetched before any feature runs; deferred chunks load lazily. The eager guardrail is 5.72 MiB. Each output file must also stay below 10 MB, where CloudFront stops compressing it. The module boundary is enforced separately by check-toolbar-graph.

Metric	Size	Δ vs base	Budget
Eager (shipped) entry + static imports	2.25 MiB · 17 files	no change	████░░░░░░ 39.3% of 5.72 MiB
Deferred (lazy)	2.09 MiB · 33 files	no change	n/a — loads on demand
Loader dist/toolbar.js	1.1 KiB	no change	█░░░░░░░░░ 5.8% of 19.5 KiB

Largest eagerly-shipped chunks

Size	File
744.5 KiB	dist/toolbar/toolbar-app-JVD2MQXK.css
582.8 KiB	dist/toolbar/chunk-chunk-4UKWPMLR.js
484.6 KiB	dist/toolbar/chunk-chunk-GTGJDCUD.js
133.8 KiB	dist/toolbar/chunk-chunk-2RWF5UDS.js
131.8 KiB	dist/toolbar/chunk-chunk-T5KY5WYR.js
71.2 KiB	dist/toolbar/toolbar-app-P4IPDGWN.js
69.0 KiB	dist/toolbar/chunk-chunk-27JL52RE.js
35.6 KiB	dist/toolbar/chunk-chunk-4UQ6YUAN.js
20.9 KiB	dist/toolbar/chunk-chunk-E6PLENAX.js
12.2 KiB	dist/toolbar/chunk-chunk-PIK3PADE.js

_{Posted automatically by check-toolbar-size · sizes are toolbar output bytes (shipped, post-tree-shake) from the esbuild metafile}

✅ Dist folder size — 🔺 +428 B (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 1462.63 MiB · 🔺 +428 B (+0.0%)

✅ Playwright — all passed

All tests passed.

View test results →

[github-actions]

🦔 Hogbox preview · ✅ ready

▶ Open the preview

🔑 Login	test@posthog.com / 12345678 (demo data)
🧩 Running	this PR's backend and frontend, on the PostHog :master base
🔗 Link	stable across rebuilds — a re-push swaps the box underneath, the URL stays
🔒 Access	tailnet only (PostHog VPN)
🛠️ Admin	inspect & debug state in hogland
💤 Idle	sleeps after ~30 min idle (snapshot to S3, zero node cost) and wakes on your next visit in ~30s, behind a brief "waking up" screen

_{commit c58f386 · box box-099bdd508e3f · ready in 614s (push → usable) · build log · rebuilds on every push, torn down on close}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix(experiments): small interaction poli..." | Re-trigger Greptile}

[trunk-io]

   

View Full Report ↗︎ ⋅ Docs

[stamphog]

Small, contained UI polish (tooltip/aria-label additions, disabled-reason text, shared formatting helper reuse, NaN/Infinity guard) with no risky-territory surface; author is on the owning team and the helper swap is verified to produce identical output.

• Author wrote 60% of the modified lines and has 114 merged PRs in these paths (familiarity MODERATE).
• 👍 on the PR from greptile-apps[bot].

Gate mechanics and policy version

Gate		Result
prerequisites	✓	all clear
deny-list	✓	no deny categories matched
size	✓	31L, 4F substantive — within ceiling
tier	✓	T1-agent / T1b-small (31L, 4F, single-area, fix)
stamphog 2.0.0b4		.stamphog/policy.yml @ c58f386 · reviewed head c58f386

[deployment-status-posthog]

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-08-25 13:18 UTC	Run
prod-us	✅ Deployed	2026-08-25 14:08 UTC	Run
prod-eu	✅ Deployed	2026-08-25 13:48 UTC	Run