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feat(appkit): send internal telemetry via AppkitLog schema#332

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jorge.calvar/send_telemetry
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feat(appkit): send internal telemetry via AppkitLog schema#332
calvarjorge wants to merge 11 commits intomainfrom
jorge.calvar/send_telemetry

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@calvarjorge calvarjorge commented Apr 30, 2026

Summary

  • Introduce the AppkitLog events (APP_STARTUP, HEARTBEAT, REQUEST_METRICS) and a TelemetryReporter singleton that owns shared dispatch state, the periodic heartbeat, and per-endpoint request metrics aggregation.
  • Server plugin records each matched route via res.on('finish') middleware; the reporter flushes one event per (method, route) on a periodic timer (configurable via APPKIT_TELEMETRY_HEARTBEAT_INTERVAL_MS / APPKIT_TELEMETRY_METRICS_FLUSH_INTERVAL_MS).
  • POSTs to /telemetry-ext?o=<workspaceId> with the workspace SP bearer token. Errors propagate from the inner senders so consumers can see exactly what was sent and how the endpoint responded; the only swallows live at the SDK's outermost boundaries (fire-and-forget startup + interval timers).
  • Adds an Internal Telemetry tab in dev-playground that lets you trigger each event on demand and renders the request, response, and an equivalent curl command. Disable globally with disableInternalTelemetry: true on createApp or APPKIT_TELEMETRY_DISABLED=true.
  • Fixes: app.yaml was missing the DATABRICKS_JOB_ID binding the jobs plugin requires (deploys to a fresh app failed startup validation); knip false-positive on the pnpm exec cdxgen-invoked @cyclonedx/cdxgen dep blocked all pre-commit hooks.

Introduce the AppkitLog event family (APP_STARTUP, HEARTBEAT,
REQUEST_METRICS) and a TelemetryReporter singleton that owns the
shared dispatch state, periodic heartbeat, and request metrics
aggregation. The server plugin records each matched route via
res.on('finish') middleware; the reporter flushes one event per
endpoint on a periodic timer. The legacy observability_log
APP_STARTUP is kept as a fallback until the AppkitLog schema is
deployed end-to-end on the telemetry backend.

Errors propagate from the inner senders so consumers can see
exactly what was POSTed and how the endpoint responded; the only
catches live at the SDK's outermost boundaries (fire-and-forget
startup + interval timers).

Adds an Internal Telemetry tab in dev-playground that lets you
trigger each event on demand and renders the request, response,
and an equivalent curl command. Disable with
disableInternalTelemetry: true or APPKIT_TELEMETRY_DISABLED=true.

Also unblocks the pre-commit knip hook by ignoring the @cyclonedx/cdxgen
dependency, which is invoked dynamically via pnpm exec from the
release:sbom script.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
The dev-playground registers the jobs() plugin, whose manifest
requires DATABRICKS_JOB_ID, but app.yaml never declared a binding
for it. As a result, deploying the playground to a fresh
Databricks App fails AppKit's startup resource validation with
"Missing required resources: job:Job [jobs]".

Add the missing entry alongside the other resource bindings.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
The bare /telemetry endpoint rejects SP bearer tokens and 302s to
/login.html?next_url=..., which the previous code tried to follow
verbatim — but a relative location is not a valid fetch URL and
threw a "Failed to parse URL" error that the legacy try/catch
silently swallowed. Switch the dispatch URL to the SP-friendly
/telemetry-ext endpoint, and harden redirect handling by resolving
the location against the original request URL.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
Now that the AppkitLog dispatch path is verified end-to-end against
/telemetry-ext, the observability_log fallback is no longer needed.
Remove sendStartupTelemetry, the dead StartupTelemetryParams /
buildEntityId / buildLegacyStartupPayload helpers, and the second
fire-and-forget block in createApp's bootstrap. Migrate the sender
test suite to cover sendAppkitLogs (which retains all the URL,
auth, redirect, and error-propagation guarantees) and rewrite the
core internal-telemetry tests against the reporter mock.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
Databricks Apps injects DATABRICKS_CLIENT_ID (the app's OAuth
client UUID) into the runtime env, not DATABRICKS_APP_ID, so the
old lookup always resolved to "" and the AppkitLog.app_id field
went out empty. Switch the bootstrap to read DATABRICKS_CLIENT_ID
so logs carry the actual per-app identifier.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
Rename APPKIT_TELEMETRY_DISABLED to DISABLE_APPKIT_INTERNAL_TELEMETRY.
The new name makes it explicit that this controls AppKit's
internal/anonymized telemetry, not the user-facing OpenTelemetry
config exposed via createApp({ telemetry }).

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
sender.ts only wrapped postTelemetry with buildAppkitPayload — one
caller, no shared logic worth a dedicated file. Have the reporter's
#send call postTelemetry directly and rename the test file from
sender.test.ts to client.test.ts so the wire-format coverage
(URL, auth, redirects, error propagation) clearly targets
postTelemetry.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
Document exactly what AppKit collects (event_name, app_id,
appkit_version, plus per-event bodies for APP_STARTUP, HEARTBEAT,
and REQUEST_METRICS), how it's sent, and the two ways to disable —
disableInternalTelemetry on createApp and the
DISABLE_APPKIT_INTERNAL_TELEMETRY env var. Bump faq.md's sidebar
position to 8 to make room. Add a one-paragraph header in the
package's index.ts pointing at the public doc.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
- Refuse cross-origin redirects from /telemetry-ext so the live SP
  Authorization header cannot be replayed against a third party.
- Fall back to serviceCtx.client.config.host when DATABRICKS_HOST
  is unset so the dispatch URL still resolves correctly when the
  SDK was given a pre-configured WorkspaceClient.
- Redact Authorization / Cookie / Set-Cookie when surfacing the
  request in the dev-playground debug UI and in the printed curl,
  so the sensitive headers don't leak via the response or get
  copy-pasted into shared logs.
- Revert the knip.json @cyclonedx/cdxgen exception. Earlier
  diagnosis was wrong — the warnings are notices, not errors, and
  the original pre-commit failures came from this branch's own
  unused exports (now trimmed). With the branch rebased on origin/
  main, knip exits 0 against the unmodified config.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
Both branches in fetchWithRedirect (cross-origin throw + same-origin
follow) want to release the redirect's response body before moving
on. Run the cancel once after we've parsed the target URL, before
deciding what to do, instead of repeating it on each side.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
The /telemetry-ext endpoint may not actually issue redirects in
practice; the follow logic was added defensively. Inline a single
fetch with redirect: "manual" so any 3xx surfaces directly to the
caller (and the dev-playground UI), making it easy to verify
whether the redirect path is exercised on real traffic.

If the deployed app never produces a 3xx response, the helper
function and its tests stay deleted; if it does, restore them.

Co-authored-by: Isaac
Signed-off-by: Jorge Calvar <jorge.calvar@databricks.com>
@calvarjorge calvarjorge force-pushed the jorge.calvar/send_telemetry branch from 04a9847 to 08378b9 Compare April 30, 2026 10:58
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