Ingest hot path + Graph auth latency. IngestTelemetry is the #1 backend
endpoint (~35.6k/day); its p99 tail was dominated not by parsing but by an
uncached Graph token: GraphTokenService minted a fresh client-credentials
token (500-1900ms POST) on every device-validation cache miss and threw it
away. Cache it per tenant.
GraphTokenService:
- Per-tenant token cache keyed on the validated tenantId; TTL from the
token's own expires_in minus a 5min skew margin, clamped to [60s, 55min]
(expires_in was previously ignored). Only successful tokens are cached.
- Per-tenant SemaphoreSlim stampede gate (bounded wait) so an enrollment
wave does not fan a burst of identical token POSTs at AAD.
- InvalidateTenant() drops the token + consent-status entries so the
consent/Graph-permission fresh-read contract still holds.
- Per-tenant invalidation generation closes the write-after-invalidate
race: a POST in flight when InvalidateTenant runs tags its entry with the
pre-invalidation generation, which readers reject.
GraphFeatureDetector:
- InvalidateTenant() now also invalidates the underlying token cache, and
applies the same generation guard to its own parsed-roles cache.
- Cross-layer order is load-bearing: invalidate the token layer FIRST, then
bump the detector generation, so a concurrent acquire cannot pair a new
detector generation with a stale token read.
IngestTelemetryFunction:
- Deserialize the request body directly from the buffered MemoryStream via
JsonTextReader instead of materializing a full UTF-16 string + ToArray()
copy (peak ~4N -> ~1N). Cap still applies before parsing; same parse
semantics. Pure allocation hygiene on the hottest endpoint.
Tests: token caching, cross-tenant isolation, failure-not-cached, stampede
coalescing (barrier-gated), in-flight write-after-invalidate, cross-layer
invalidation, and cross-layer ordering -- each verified red without its fix.
Parse hygiene: PayloadJson stays a raw string, malformed -> 400.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds opt-in resolution of Intune Platform Script + Remediation display names in
session timelines via a tenant-side appRoleAssignment grant. No app manifest
change, no impact on customers who don't enable it. Architecture is reusable for
future optional Graph permissions: catalog -> detector -> resolver -> endpoint.
Backend
- GraphFeatureDetector parses the `roles` claim from the SP access token and
caches the (token, roles) bundle per tenant. GetSnapshotAsync surfaces a
transient flag so admin-UI callers can render "unknown" instead of a
misleading "0 of 0 granted" when token acquire times out.
- GraphTokenService now accepts a CancellationToken so optional-feature callers
can apply tight budgets instead of inheriting the 5+15+30 s retry chain.
- ScriptDisplayNameResolver: cache-first, list-pull-on-cold-tenant, per-ID
fallback. Throttle-aware abort: skip per-ID for kinds whose full-pull hit a
transient failure; break the per-ID loop on the first HttpRequestException.
Total budget 5 s, with a tight 1.5 s sub-budget on the token acquire.
- Azure Table `ScriptNameCache` + direct-TableClient fail-loud repository
(mirrors TableOffboardingAuditRepository pattern). Daily
ScriptNameCacheCleanupFunction: 7 d positive / 1 h NotFound TTL.
- POST /api/tenants/{id}/scripts/display-names (body-carried refs to dodge URL
length limits; backend cap 200 refs/request).
- GET /api/tenants/{id}/graph-permissions/status (4 s budget; includes app
ClientId so the UI can render an exact grant command).
- POST /api/tenants/{id}/graph-permissions/refresh (invalidates token cache).
- All three routes registered in EndpointAccessPolicyCatalog (MemberRead for the
resolve, TenantAdminOrGA for the admin-UI surfaces).
Web
- `useScriptDisplayNames` hook with stable refset fingerprint (no spurious
refetches on parent re-renders); clears stale map on tenant/refset change so
a session switch never leaks names across tenants.
- Chunked POST loop: 200-ref batches with partial-success semantics. Preserves
earlier chunks when later ones fail (non-2xx OR transport throw); only
TokenExpiredError propagates so auth flow can react.
- ScriptExecutions renders " . {DisplayName}" alongside existing label/short-id,
keyed by Kind + policyId so Platform/Remediation under the same id never
collide.
- New Settings section "Optional Graph capabilities": status table with granted
/ not granted / unknown, copy-paste PS one-liner with ClientId baked in,
refresh button gated on response.ok.
Customer-facing
- scripts/CustomerSetup/Grant-AutopilotMonitorAddOn.ps1: idempotent
grant / verify / revoke script. -Features ScriptDisplayNames (high level) or
-Permissions ... (admin-UI generated). Pure ASCII for PS 5.1 compat.
- docs/customer-graph-add-on-permissions.md: end-to-end customer guide
covering prerequisites, the appRoleAssignment pattern, and revocation.
Tests
- 1718 backend xUnit / 364 web vitest. Highlights: JWT roles parsing edge
cases; full-pull-429 suppresses per-ID; per-ID-429 breaks loop; transient
detection via GetSnapshotAsync; chunked partial success (HTTP failure + thrown
transport); TokenExpiredError propagation; EndpointPolicyCatalogCompleteness
covers the three new routes by reflection.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds a second device validation method alongside existing Autopilot Device
Validation. Corporate Identifier Validation checks devices against Intune
Corporate Device Identifiers (manufacturer + model + serial number) via the
Graph beta searchExistingIdentities endpoint.
Backend: Extract GraphTokenService from AutopilotDeviceValidator for shared
token/consent logic. Add CorporateIdentifierValidator with caching. Update
SecurityValidator with cascading validation (Autopilot first, Corporate
Identifier fallback). Wire new validator through all agent endpoints.
Frontend: Add second toggle in settings gated behind preview mode. Shared
consent flow skips redirect when consent already exists from other toggle.
Section renamed to "Enrollment Device Validation" in preview mode.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Oliver Kieselbach