feat(telemetry): compare Assets boot performance by cohort - #1524
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughChangesAssets boot telemetry
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to Telemetry comparisons can include older incomplete records until both queries exclude missing opt-in state. Add the predicate before relying on these queries for cohort analysis. 🚥 Pre-merge checks | ✅ 2✅ Passed checks (2 passed)
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christian-byrne
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christian-byrne
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Assets measurement needs current-base integration.
Full context for agent readers
Targeted self-review of the three-file boot-cohort change against the updated launch-gate behavior. This draft still uses the old base. The inline finding covers semantic integration needed before using these events for performance comparisons; no replacement PR is needed. No packaged execution of this draft is claimed.
Glossary: cohort means the group used to compare boot measurements; effective arguments are what Core actually receives.
| const coreBetaFlags = coreBeta.applied.map((grant) => grant.arg) | ||
| return { | ||
| core_beta_flags: coreBetaFlags, | ||
| assets_enabled: coreBetaFlags.includes('--enable-assets') |
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issue: On the updated launch-gate base, manual --enable-assets survives beta opt-out and yields coreBeta.applied = []. This expression then reports assets_enabled=false although Core runs Assets, putting enabled boots in the disabled performance cohort. Keep core_beta_flags as grant attribution, but derive the effective Assets measurement independently from the final launch state, including manual arguments and Core defaults. Add a case with manual --enable-assets and no grant when integrating the current base.
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Fixed in the rebased revision: assets_enabled reads the final launch arguments independently of grants. Added opt-out/manual-flag and no-grant cases. The contract now explicitly measures an argument, not Core defaults or service health. Remote CI pending; local runtime deferred.
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Reviewing the new commit only (122a6fb9) — note that 20 of the 21 commits here already landed on main separately, so the 3412-line diff GitHub renders is mostly already-merged work and the PR is currently CONFLICTING. The approach is right and the code is clean on the paths it covers, but three things need resolving: the derivation breaks when rebased onto main, the Assets-off arm isn't a usable control, and assets_enabled inverts once Core defaults Assets on.
Full context for agents
Scope
The genuinely new change is 15 lines of product code, 70 of tests, 67 of docs.
The other 20 commits landed as #1487, #1537 and #1539.
What's good
Deriving the cohort from post-gate applied grants rather than the opt-in
toggle is the correct instinct — an opted-in launch on an older Core genuinely
isn't in the Assets-on cohort. Privacy is fine: a boolean plus
Desktop-controlled flag names, consent gate untouched. Tests pass (55).
The three blockers
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The rebase changes what the correct derivation is.
maindeliberately
reversed this branch's design —stripCanaryArgsis gone, and
selectCoreCanaryArgsnow withholds a grant when the user already passed
that arg, because these are first-class user-settable options in the
launch-args UI. After rebasing, a user who types--enable-assetsby hand
getsassets_enabled: falsewhile Assets is on, on the success path with no
failure condition. -
The Assets-off arm isn't a control.
assets_enabled = falsecollapses
five distinct causes, and the queries group only byapp_version— the
Desktop version, which controls for none of them. -
assets_enabledinverts once Core defaults Assets on.mainadded
--disable-assetsto the allowlist for exactly that future. Worth deciding
now rather than after the numbers start lying.
Optional coverage note
The three new tests cover applied-true, opted-out-false and failure-keeps-true,
but not the case the new comment on bootCohort() exists to justify (opted in,
grant selected, Core's schema refuses it). The harness supports it in one line:
schemaNames without 'enable-assets', betaEnabled left at its default, then
assert assets_enabled === false while opt_state.opted_in is true.
| betaEnabled | ||
| }) | ||
| launchCmd.args = built.args | ||
| coreBeta = built.beta |
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This is the only place coreBeta is ever assigned and it's inside the try — the bare catch below skips both it and stripCanaryArgs, so a baked --enable-assets reaches Core while the boot is tagged false. Same fix as on bootCohort(), and worth a regression test.
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Mechanism
When getComfyArgsSchema rejects, coreBeta stays noCoreBeta(betaEnabled)
and stripCanaryArgs never runs either, since it lives inside
buildLaunchArgs. A --enable-assets sitting in the install record's
user-editable launchArgs therefore survives onto the command line: Core boots
with Assets on, and the boot reports assets_enabled: false,
core_beta_flags: [].
The catch body is just // Schema not available — pass args as-is.
Both conditions are realistic
- Stored flag — documented rather than hypothetical. The
stripCanaryArgs
docstring exists specifically for "a dogfood install whose stored
launchArgshad a flag baked in at install time". - Schema rejection — a broken venv, a custom node that raises during
main.py --help, or simply the 15 sexecFiletimeout inrunHelp.
Test
launchHarness.schemaThrows = true plus an --enable-assets in the harness
launchCommand.args.
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Fixed in the rebased revision: the cohort reads final arguments, so preserved manual flags count even when schema discovery fails. Added both failure arms, with and without a manual flag. Remote CI pending; no new local test result claimed.
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| | Property | Meaning | | ||
| | ----------------- | ------------------------------------------------------------------------------------------------------------ | | ||
| | `assets_enabled` | Whether `--enable-assets` was actually applied to this launch after Desktop's version and Core-schema gates. | |
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"actually applied" is stated as an absolute, and two paths break it — a schema-discovery failure leaving a baked flag on the command line, and (post-rebase) any user who sets the flag by hand. Either fix the derivation and keep this wording, or soften it to describe what the field really is: whether the canary granted the flag.
Full context for agents
Both paths are commented on the code:
bootCohort()— the rebase case, wheremainwithholds the grant because the
user passed the arg themselves.coreBeta = built.beta— the schema-discovery failure case, where neither the
assignment norstripCanaryArgsruns.
Whichever way this resolves, the doc and the derivation should agree — right now
the doc is the stronger claim of the two.
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Updated the derivation and contract in the rebased revision. The field measures the final explicit argument, including manual flags, not grant presence or successful service initialization.
| | `app_version` | Desktop version, attached centrally by `src/main/lib/telemetry.ts`. | | ||
| | `boot_id` | Per-launch join key shared by the lifecycle events. Retries reuse the same key. | | ||
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| `assets_enabled = false` means the running launch did not receive the Assets argument, including an |
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This is the one I'd most want resolved before merging: assets_enabled = false collapses five distinct causes, and the two arms differ structurally in Core version, so this bucket is a population rather than a control. Minimum fix is adding core_beta_opted_in and core_version to bootCohort() — both are already on the CoreBetaLaunch it reads.
Full context for agents
Why the arms aren't comparable
assets_enabled = true requires four independent conditions to hold at once:
the beta toggle resolves true, PostHog actually serves a grant to this client,
the install's Core semver sits inside the grant window, and the running Core's
--help schema knows the flag. false is everything else.
The Core-version skew isn't incidental, it's structural. parseCoreCanaryFlags
drops any grant without a parseable min_core_version, so every grant that can
ever apply carries a version floor. The Assets-on arm is bounded below by that
floor; the Assets-off arm contains, by construction, every install beneath it.
The two distributions can only match if no install is below the floor — which
would make the gate pointless. Boot time and boot-failure rate both move with
Core version, so that confound sits directly on the metric.
Nothing on these events recovers it
variantis the standalone build flavour, a frozen install-time
fingerprint — not a Core version.core_beta.opt_state(opted_in) andcore_beta.applied(core_version) do
carry the missing facts, but neither carriesboot_idorinstallation_id,
so they can't be joined to a boot.core_beta.appliedonly fires when something applied or was dropped, so a
fully opted-out boot emits no Core version at all.
Beyond the minimum fix
Adding the two fields still doesn't fully establish eligibility — selection also
checks an upper bound, exact/verified/current tag status, and schema support. If
we want a genuinely comparable control, the cleaner shape is an explicit
ineligibility reason (below-floor / above-ceiling / unverified /
schema-refused / not-granted) rather than one boolean absorbing all five.
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Added opt-in and recorded Core version to all three boot events in the rebased revision. Both queries segment by those fields. The docs explicitly retain the remaining eligibility/selection limits and make no causal claim; this does not add an eligibility-reason taxonomy.
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| The normal telemetry consent gate still applies. No paths, filenames, asset names, prompts, model | ||
| metadata, or other user content are added. This follows the telemetry privacy rules documented in | ||
| `src/main/lib/telemetry.ts` and ADR-029. |
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ADR-029 doesn't exist in this repo — it appears exactly once, on this line. Either link it if it lives in an external wiki, or drop it and cite the telemetry.ts privacy block directly.
Full context for agents
Verified by repo-wide grep: one occurrence, no docs/adr/ directory, no other
ADR reference in any .md, .ts or .json file. Anyone following the citation
to audit the privacy claim has nothing to follow.
The telemetry.ts half is real and does carry the rule being honoured here.
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Removed the unavailable citation and linked the existing telemetry.ts privacy rules directly in the rebased revision.
| Boot duration by Desktop version and applied Assets state: | ||
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| ```sql | ||
| SELECT |
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app_version is the Desktop version — it controls for none of the four conditions behind assets_enabled, and in particular not for Core version, which is the one that's structurally skewed between the arms. As written this answers "newer-Core, opted-in installs versus everyone else".
Full context for agents
See the comment on the cohort contract above for why the Core-version skew is
structural rather than incidental.
Worth stating the observational nature in the doc even after the extra fields
are added — segmentation improves the comparison but doesn't make it causal.
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The duration query now groups by Desktop version, recorded Core version, beta opt-in and the Assets argument in the rebased revision. The surrounding text calls it observational and notes that version labels can lag a modified checkout.
| Boot outcome by Desktop version and applied Assets state: | ||
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| ```sql | ||
| SELECT |
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Same grouping problem as the duration query, and it bites harder here because boot failure correlates with exactly the install conditions that also push a boot into the false bucket. The uniqIf(properties.boot_id, ...) dedup is correct though — worth keeping.
Full context for agents
The correlated-bias mechanism
The schema-discovery failure path is the concrete case: installs where
main.py --help times out or raises are disproportionately the slow or damaged
ones, and those boots are both more likely to fail and guaranteed to be tagged
assets_enabled: false.
I wouldn't claim a magnitude — this is a mechanism the code makes possible, not
something it establishes — but the direction is the one that flatters Assets,
which is the uncomfortable direction for a decision metric.
On the dedup
boot_id is generated once per logical boot and reused across port and reboot
retries, so retry-inflated boot_started counts don't skew the rate. The
uniqIf is the right call here.
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Applied the same segmentation to outcomes and retained distinct boot_id counts in the rebased revision. Also documented recent incomplete boots, cancellations and time-window boundary effects; no claim that segmentation eliminates selection bias.
| ORDER BY desktop_version DESC, assets_enabled DESC | ||
| ``` | ||
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| Use the first query as a trend grouped by `assets_enabled`; use the second as a table. Do not compare |
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This covers sample size but not comparability. Suggest saying explicitly that assets_enabled = false is a population rather than a control, that the arms differ systematically in Core version, and that differences shouldn't be read as the causal effect of Assets without further segmentation.
Full context for agents
The caveat as written guards against one failure mode (thin cohorts) while the
larger one — that the two cohorts were never comparable populations to begin
with — goes unstated. A reader who satisfies the sample-size condition will
reasonably assume the comparison is otherwise sound.
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The contract now says this is observational, identifies the mixed off population, and warns against attributing differences to Assets in the rebased revision. Counts alone are not treated as evidence of comparability.
| actionData: {} | ||
| }) | ||
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| beforeEach(() => { |
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launchHarness.waitForPort is the one harness field not reset here, and the new terminal-failure test leaves a thrower behind for the rest of the file. Nothing breaks today, but one line — launchHarness.waitForPort = null — closes it.
Full context for agents
What's reset and what isn't
Eight sibling fields are restored here: schemaThrows, betaEnabled,
betaEnabledThrows, schemaNames, grants, duringResourceAcquire, spawn,
launchCommand. waitForPort is not.
The new terminal-failure test sets it to
async () => { throw new Error('boot timed out') } and never restores it, so it
persists for the remainder of the file.
Why it's harmless now and a hazard later
Both tests that follow run with skipPortWait: true, so the probe is never
reached. But the next test added to this block on the normal port path would
silently inherit a rigged boot failure with no cause visible at its own call
site — the kind of thing AGENTS.md's zero-tolerance flaky-test line is aimed at.
The one-line reset also makes the pre-existing leak from the port-conflict test
safe.
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Added launchHarness.waitForPort = null to the per-case reset in the rebased revision. Remote CI is running; local checks remain deferred under the host-resource restriction.
Addresses #1524 (comment) Local execution deferred under the owner resource-safety hold.
Derive the Assets cohort from final arguments, retain grant attribution, and carry opt-in plus the recorded Core version on each boot event. Addresses #1524 (comment) Addresses #1524 (comment) Addresses #1524 (comment) Regression cases added for manual, filtered, ungranted and discovery-failure launches. Local execution deferred under the owner resource-safety hold.
Document the launch-argument contract and recorded-version limits, segment queries by Core version and opt-in, and retain retry deduplication. Replace the nonexistent ADR reference with the telemetry privacy source. Addresses #1524 (comment) Addresses #1524 (comment) Addresses #1524 (comment) Addresses #1524 (comment) Addresses #1524 (comment)
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The Full context for agentsSymptomFive of the six cases fail at CauseEvery case calls EvidenceTwo checks, both reproducible locally at
Fixconst res = await handleLaunch(ctxFor(`harness-assets-cohort-${_description.replace(/ /g, '-')}`))Any unique-per-case id does it. NoteThis reproduces deterministically, so it isn't infra flake — but it is order-dependent, which is the shape Answering from my context. 👎 if unhelpful. |
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I ran both proposed queries against real data. They're valid — the alias reuse in the outcome query works fine — but Full context for agentsWhat I checkedBoth queries parse and execute as written. The new properties don't exist yet (unmerged), so they return no rows; I re-ran the same aggregation shapes against the existing The problemA small number of The prevalence is tiny, on the order of 0.001% of boots. That is more than enough to destroy Why it matters here specificallyThe dangerous case isn't the obviously absurd one. On one Desktop version a single bad row pulls the mean down by about 22% without ever going negative — a plausible-looking number that nobody would question. This query compares cohorts, and the Assets-on arm starts small. One machine with a clock problem landing in one arm can move that arm's mean enough to invert the comparison, at a prevalence far too low to notice in the row counts. Suggested fixBound the value in the AND toFloat(properties.boot_time_ms) BETWEEN 0 AND 3600000The Alternatively drop ScopeThis is pre-existing in Answering from my context. 👎 if unhelpful. |
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Happy to approve once tests resolved |
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Actionable comments posted: 1
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Inline comments:
In `@docs/assets-performance-telemetry.md`:
- Around line 52-77: Add the non-null predicate for
properties.core_beta_opted_in to both telemetry queries, alongside the existing
assets_enabled filter. Leave core_version nullable so unknown Core versions
remain grouped separately.
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Implementation, tests and verification
boot_started,boot_completedandboot_failedshareassets_enabled,core_beta_flags,core_beta_opted_inandcore_versionproperties.assets_enabledreflects the final explicit--enable-assetsargument, includingmanual arguments after opt-out or schema-discovery failure. Managed grant attribution
remains separate. This does not prove that Core's Assets service initialized or detect
a future Core default without that argument.
The version is the installation's recorded Core release label, not an independently
verified live checkout. Desktop version remains attached centrally. Existing telemetry
consent applies; no new Core instrumentation, paths or asset metadata are added.
The original launch-gate dependency has merged. This branch now targets
mainandcontains only the telemetry changes, not a replacement implementation stack.
Six regression cases distinguish manual flags, opt-out, absent grants, schema failure
and schema rejection. Existing retry and terminal-failure cases assert cohort fields;
the boot probe resets between cases. The PostHog queries group by Desktop version,
recorded Core version and opt-in, retain distinct-boot outcome counts, and explicitly
describe observational comparisons rather than causal effects.
src/main/lib/ipc/sessionActions/launch.tssrc/main/lib/ipc/sessionActions/launch.test.tsdocs/assets-performance-telemetry.mdVerification: source review, unchanged-patch comparison after rebase and whitespace
check complete. Local tests, lint, formatting, typecheck and builds were not run under
the owner's host-resource restriction. Historical test results do not certify this
revision. The previous run passed three-platform end-to-end, integration and static checks but failed five new unit cases because they reused an installation ID. Each case now uses its own ID; all assertions are unchanged. Current-head CI: unit tests now pass (88 launch tests; 5200 overall, 2 skipped), as do integration, static checks and Windows/macOS end-to-end. Linux end-to-end also passed. Simon approved this exact head, and Christian merged it September 22 at 01:04 UTC. Post-merge CI passed, including all three end-to-end platforms, unit, integration and static checks.
Glossary: cohort means launches grouped by recorded properties; a grant is a managed
beta argument; CI is the automated GitHub verification run.