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Oliver Kieselbach fd7d3973e7 fix(agent): esp_policy_provider_stalled gains sidecar-missing arm (issue #106 )

Customer follow-up corrected the field-case mechanics: TrackingPoliciesCreated=1
WAS set under the foreign ConfigMgr provider - the ESP ignores a foreign
provider's completion values and waits on the Intune-registered "Sidecar"
provider by name (renaming the key unblocks instantly without creating any
tracking entries). The completeness-keyed detector would have missed exactly
the incident it was built for.

- Arm 2: >=1 Setup\Apps provider registered without Sidecar, continuously for
  the 15-min dwell -> reason=sidecar_provider_missing; clock resets when
  Sidecar registers later (legitimate startup ordering); DevicePreparation-only
  snapshots don't activate it
- Arm 1 (continuously-incomplete providers) unchanged -> reason=provider_incomplete;
  sidecar-missing wins when both arms cross in one round (single event)
- Cross-restart fingerprint gains a "sidecarMissing" sentinel; payload adds
  reason + sidecarMissingForMinutes
- Regression test: ConfigMgr complete + Sidecar absent -> fires (previously
  classified healthy); probe/doc headers and OKF doc corrected, web event-type
  description updated

Evidence (research session c7e3db08): Intune's ESP-policy WAP payload always
registers Sidecar (ConfigMgr only via co-management settings policy, per
Niehaus' documented payload); Microsoft's ESP troubleshooting models app
tracking exclusively through the Sidecar subkey.

Agent tests 2043/2043, web tsc clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-24 16:48:50 +02:00

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Autopilot Monitor — Technical Knowledge Bundle

Contributor-facing technical documentation for Autopilot Monitor, organized as an Open Knowledge Format (OKF) knowledge bundle. Customer-facing product documentation lives at https://docs.autopilotmonitor.com (separate repository).

Architecture

Architecture Guide - High-level architecture overview and solution layout for contributors.
Version Contract - One version shape for agent, backend and MCP: the ETag-CAS counter blob that mints build numbers, and the manifests published only after a deploy is verified live.
URL Registry - Every well-known host lives in one registry file per component (Constants.cs / utils/config.ts / src/config.ts), enforced by guard tests; includes the agent-download migration to the download alias and its deploy-order constraint.

Agent

V2 Agent - How the on-device agent works: runtime overview, decision engine (reducer, signals, completion arms), logs & persistence (signal log, snapshot, crash recovery), Hello wizard un-skip (why a single "WHfB disabled" read never decides completion), Autopilot ZTD diagnostics (event IDs, diagnostic registry, endpoints, error-code map).
Build Counter Blob - How agent build numbers are minted: shared counter blob with ETag-CAS so local and CI builds never collide; CI additionally attests build provenance (Sigstore).
Agent Endpoint Migration - How the backend re-homes agents to a new API base URL via the config channel (backend move or per-tenant region move): live-fetch-only, allowlist-validated on both sides, one hop, kill wins.
MDM Reboot Coalescing - Attributing the mid-ESP coalesced reboot ("second sign-in") to the device-assigned policy URIs that forced it: aggregated DM-Enterprise 2800 observations (neutral, flush-time watermark) + the ANALYZE-ESP-005 advisory gated on an actually-observed reboot.
Secure Boot CA-2023 Detection - Why ANALYZE-SEC-001 v3 reads the UEFI db/KEK variables directly instead of trusting the SecureBoot\Servicing registry, and how the one-sided uefiCa2023FirmwareConfirmed marker plus a not_exists precondition give absence-tolerant suppression across old and new agents.
ESP Policy-Provider Stall Detection - The EnrollmentStatusTracking CSP's no-timeout Setup/Apps wait is keyed to the Intune-registered "Sidecar" provider by NAME: co-management's "ConfigMgr" parks the user ESP at "Apps (Identifying)" for days even with TrackingPoliciesCreated=1 (issue #106); the always-on two-arm esp_policy_provider_stalled tripwire (provider_incomplete | sidecar_provider_missing) and the SOFTWARE\Microsoft\Windows\Autopilot gather-rule allowlist entry that surface it.

Rules

Gather Rule Phase Scoping, One-Shot Triggers & Emit-on-Change - Restricting gather rules to enrollment phases (activePhases / activeFromPhase sticky latch), one-shot collection at a phase's start/end (phase_change / phase_exit), and emitMode "on_change" result-dedup.
Gather Rule Guardrails - Why the allowlists in rules/guardrails.json are enforced on the agent and nowhere else, which hard blocks survive unrestricted mode, and the rule that every collector must call a guard and emit security_warning on refusal.

Backend

Business Timestamps - Why the Azure Tables system Timestamp is never authoritative (migrations reset it), and the OccurredUtc + RowKey-decode compensation for AuditLogs/OpsEvents/Events after the 2026-07-18 migration.

MCP Server

MCP Docs Corpus - How the published customer documentation becomes the search_docs corpus: CRLF-safe heading chunking, build-time embedding as a third precomputed section, and why a docs edit needs an MCP redeploy.

Security & Identity

MCP OAuth Flow - Who authenticates where when connecting an AI client to the MCP server; two identities, three parties plus Entra ID.

Conventions for this bundle

Every concept document is a markdown file with YAML frontmatter; type is mandatory, title, description, resource, tags, and timestamp are recommended.
Use standard relative markdown links between documents (e.g. agent/overview.md, ../architecture.md). Do NOT use the spec's /-prefixed bundle-absolute form — GitHub resolves those against the repo root (missing /docs) and navigation breaks.
Record notable additions and changes in log.md.
index.md and log.md are reserved names — never use them for concept documents.

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