64 lines
4.8 KiB
Markdown
64 lines
4.8 KiB
Markdown
# Live POC — frozen facts
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Self-hosted on `backstage-wus2-v4` via Flux; vendor Helm chart **1.8.8**
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(`apps/arcade/` in `k8s-backstage-v2`, `origin/master`). **Run the live-state check
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(GROUND-RULES) before trusting any of this — it ages.**
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## Deployment
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- **Endpoints:** `api.arcade.st.dev` (MCP/engine), `coordinator.`, `dashboard.`,
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`experience.arcade.st.dev`. Gateway URLs: `https://api.arcade.st.dev/mcp/{slug}`.
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- **Upstream IdP:** ServiceTitan **Entra ID** app registration (iac PR #4012). Not Okta yet
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(Okta is the criteria doc's eventual target — note the gap when scoring identity / cat 2).
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- **Chat/playground:** **disabled** (`features.chatEnabled: false`); engine LLM + embeddings
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routed through in-cluster **LiteLLM**, not api.openai.com.
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- **Datastores:** bundled in-cluster Postgres + Redis, default passwords, ephemeral.
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## Observability (cat 5 — confirmed)
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- **OTEL (evidence, Kibana 2026-06-18):** the `arcade-engine` pod emits OTLP metrics by
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default but the target collector **does not resolve** — repeating ~60s:
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`failed to upload metrics: Post "http://arcade-otel-collector:4318/v1/metrics": dial tcp:
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lookup arcade-otel-collector ... no such host`. Instrumentation is ON; the collector Service
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`arcade-otel-collector` is **not deployed/resolvable** in the `arcade` ns; every metric is
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dropped. (Chart lists the collector image but the HelmRelease never enabled/named it.)
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- **Logs → ELK:** Vector daemonset scrapes pod stdout/stderr cluster-wide → ELK. Engine logs
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already reach Kibana (that's how the above error is visible). Visible fields incl.
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`Tracing.TraceId`, `ContextInfo.CorrelationId`, `NetCore.RequestPath` → engine is a .NET app
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emitting structured logs with trace/correlation IDs (relevant to trace propagation pre-OTEL).
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- **Metrics pipeline (metrics ≠ logs):** metrics do **not** go to ELK. **Metrics → Grafana**,
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via the **Grafana Agent Operator** (`MetricsInstance` `main`, ns `monitoring`) which scrapes
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**all `ServiceMonitor`/`PodMonitor` CRs cluster-wide** (any namespace; excludes ServiceMonitors
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labeled `grafana-agent: external`) and `remoteWrite`s to **Grafana Mimir**
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(`http://mimir-nginx.mimir.observability-wus2/api/v1/push`, tenant header
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`X-Scope-OrgID: k8s-backstage-v4`). Convention: an app exposes a Prometheus `/metrics` port +
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a `ServiceMonitor` (label `release: prometheus-operator`) → auto-scraped → Grafana.
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- **Two cat-5 gaps for metrics:** (a) no collector — `arcade-otel-collector:4318` doesn't
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resolve; (b) no bridge from OTLP-push into the pull-based Prometheus/Mimir pipeline. Fix = an
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OTEL Collector in `arcade` ns that ingests the engine's OTLP and EITHER exposes a `prometheus`
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exporter `/metrics` scraped via a `ServiceMonitor`, OR `prometheusremotewrite` straight to the
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Mimir push URL+tenant above. (Chart may bundle a disabled collector subchart — verify first.)
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## Live fixtures (filled in Phase 1)
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- **Project:** _TBD (Task 1.1)_
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- **API key:** _label / last-4 only — never the key (Task 1.1)_
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- **Headless auth header convention (confirmed via Arcade docs 2026-06-18):** MCP gateway calls use
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`Authorization: Bearer <ARCADE_API_KEY>` + `Arcade-User-ID: <user_id>`. The user_id is any stable
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string (an email works); this mode is for clients without browser auth / token refresh. Self-hosted
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gateway URL: `https://api.arcade.st.dev/mcp/<slug>`. (Source: docs.arcade.dev call-tool-client.)
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- **Baseline gateway:** `zeb-gateway-test` — auth mode **Arcade Headers** (API key + `Arcade-User-ID`);
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7 main-catalog tools (Slack ×2, GoogleDocs ×4, Brightdata ×1). See `config/targets.yaml`.
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Confirmed live 2026-06-18: tool list is gateway-wide (same for all `Arcade-User-ID`s).
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- **Shared reference server:** `arcade-eval-ref` (dashboard id `military-healthy-posted-rats`), toolkit
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`ArcadeEvalRef`, tools Echo/Add/Whoami — self-hosted at `lib/mcp_server`, registered via a Cloudflare
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**quick** tunnel (ephemeral URL in `results/tunnel_url.txt`; re-register on restart). whoami exec-proof
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verified (A→user-a, B→user-b).
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- **`whoami` identity field:** server reads `context.user_id` (arcade_mcp_server `Context`), populated by the Engine from the calling user (`Arcade-User-ID` / auth `sub`).
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## Known behaviors (findings)
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- **`arcade deploy` is cloud-only.** It validates the server locally fine (health, tool + secret
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discovery — our ref server: 3 tools, 0 secrets), but POSTs the deployment to `api.arcade.dev`
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(`PROD_ENGINE_HOST`), ignoring the `arcade login --host` coordinator — so against our self-hosted
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instance it returns **401**. `deploy` exposes no `--host`. **Implication:** self-hosted custom
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servers must be **registered** (run the server + dashboard "Add Server", type Arcade, URL + worker
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secret) — the tunnel pattern for local dev, or an in-cluster deploy for prod — not `arcade deploy`.
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Relevant to cat-4 (SDK/deploy), cat-8 (deployment), cat-9 (DX).
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