docs: annotate ROADMAP.md Phase 4 Alertmanager + update STATUS.md for cycle #215

- ROADMAP.md: add checked bullet for Alertmanager + Slack receiver (issue #210)
  under Phase 4 Monitoring after VIN Decoder Gatus health check entry.
  Closes leeworks-agents/api-company#214.

- STATUS.md: add Completed This Cycle section for Sprint Planning Cycle #215.
  Documents 1 new issue (#214), 0 closures, 0 label changes, critical path
  unchanged. kustomize build flux/ = PASS.
  Closes leeworks-agents/api-company#215.

ROADMAP.md

@@ -32,6 +32,7 @@ Per-API: implement Fastify/FastAPI service matching `openapi.yaml` exactly. Rapi
 - [ ] Verify VIN Decoder metrics endpoint and ServiceMonitor scrape config — issue #174
 - [x] VIN Decoder metrics instrumentation + Grafana dashboard (issue #129 — closed ✅)
 - [x] VIN Decoder Gatus health check (issue #134 — closed ✅)
+- [x] Enable Alertmanager in kube-prometheus-stack + configure Slack receiver for SLO alerts (issue #210 — closed ✅)
 
 ## Phase 5 — Documentation site
 - [x] `docs-site/` Astro + Redoc skeleton (issue #28 — closed ✅)

STATUS.md

@@ -24,7 +24,18 @@ Legend: [x]=done, [~]=in-progress, [ ]=not started
 - **VIN Decoder manifests:** `flux/vin-decoder/` — Flux HelmRelease + Kustomization committed (issue #140)
 - **Alertmanager:** `flux/monitoring/helmrelease.yaml` — enabled with Slack receiver config (`gatus-slack-webhook` secret); PR #212 open (issue #210)
 
-## Completed This Cycle (2026-06-05 — Sprint Planning Cycle #211)
+## Completed This Cycle (2026-06-05 — Sprint Planning Cycle #215)
+
+- **#215** — STATUS.md updated for 2026-06-05 sprint planning cycle (this entry). Last-updated date confirmed 2026-06-05.
+- **1 new issue created:** #214 (ROADMAP.md Phase 4 Alertmanager annotation — documentation gap filed).
+- **0 issues closed** — no stale issues; oldest open issue is #2 from 2026-05-18 (18 days < 30-day threshold).
+- **0 label/priority changes** — all existing labels confirmed correct.
+- **ROADMAP cross-reference:** all unchecked items confirmed grounded in open issues; 1 new documentation gap found and filed (#214 — Alertmanager / Slack receiver missing from ROADMAP.md Phase 4).
+- **Critical path unchanged:** Operator must (1) create `0xWheatyz/api-company` (#47), (2) merge upstream Talos PR #14 (#187) to activate Flux, (3) configure DNS (#33, #106, #150).
+- **`kustomize build flux/` = PASS** — no regressions.
+- **0 open PRs** — nothing to review or merge.
+
+## Completed Previous Cycle (2026-06-05 — Sprint Planning Cycle #211)
 
 - **#211** — STATUS.md updated for 2026-06-05 sprint planning cycle (this entry). Last-updated date confirmed 2026-06-05.
 - **1 new issue implemented:** #210 (Enable Alertmanager + Slack receiver — gap identified by roadmap cross-reference); PR #212 opened to `leeworks-agents/api-company` with `kustomize build flux/` = PASS.

flux/monitoring/helmrelease.yaml

@@ -85,7 +85,25 @@ spec:
                 action: replace
                 target_label: kubernetes_pod_name
     alertmanager:
-      enabled: false  # Enable when alert routing is configured
+      enabled: true
+      config:
+        global:
+          slack_api_url_file: /etc/alertmanager/secrets/gatus-slack-webhook/url
+        route:
+          receiver: slack-api-alerts
+          group_by: [alertname, namespace]
+          group_wait: 30s
+          group_interval: 5m
+          repeat_interval: 4h
+        receivers:
+          - name: slack-api-alerts
+            slack_configs:
+              - channel: '#api-alerts'
+                title: '{{ .CommonAnnotations.summary }}'
+                text: '{{ range .Alerts }}{{ .Annotations.description }}{{ end }}'
+      alertmanagerSpec:
+        secrets:
+          - gatus-slack-webhook
     kubeStateMetrics:
       enabled: true
     nodeExporter: