infra: export appset and mirror alert polish

apps/monitoring/noc-monitoring.yaml

@@ -1244,6 +1244,58 @@ data:
               summary: "Marquee animation duration drifting > 10% on {{ $labels.renderer }} ({{ $labels.phase }})"
               description: "Median observed cycle duration deviates from target DurationMs by >10%. Could indicate browser tab throttling, GPU pressure, or phase-advancement bug."
 
+      # ============================================================
+      # Update Center public-edge probes
+      # Live-mirrored from FlowerCore.Notes/scripts/monitoring/alerts.yml.
+      # This K8s ConfigMap is the future migration target; live Prometheus
+      # still reads the canonical Notes file from noc1 Podman.
+      # ============================================================
+      - name: update_center
+        rules:
+          # Critical only when the edge is genuinely unreachable. A Cloudflare
+          # HTTP 429 means the prober hit a rate-limit, not that real clients
+          # are down, so the warning rule below owns that signal.
+          - alert: UpdateCenterPublicEdgeDown
+            expr: |
+              (probe_success{job="probe-update-center-public-edge"} == 0)
+              unless on(instance)
+              (probe_http_status_code{job="probe-update-center-public-edge"} == 429)
+            for: 10m
+            labels:
+              severity: critical
+              service: update-center
+              alert_channel: irc
+            annotations:
+              summary: "Update Center public edge probe failed for {{ $labels.instance }}"
+              description: >-
+                The external probe for {{ $labels.instance }} failed for 10 minutes with a
+                non-2xx status that is not a rate-limit. Public Update Center clients may be
+                unable to fetch manifest schema metadata through Cloudflare.
+              runbook: >-
+                1. curl -sk https://{{ $labels.instance }}/api/v1/manifests/_schema
+                2. Verify Cloudflare DNS record is proxied and targets the current public edge IP
+                3. kubectl -n fc-updater get ingressroute updatecenter-web-public secret cf-origin-flowercore-io
+                4. Check Traefik logs for Method() or TLS secret errors
+
+          - alert: UpdateCenterPublicEdgeRateLimited
+            expr: probe_http_status_code{job="probe-update-center-public-edge"} == 429
+            for: 15m
+            labels:
+              severity: warning
+              service: update-center
+              alert_channel: irc
+            annotations:
+              summary: "Cloudflare is rate-limiting (HTTP 429) the public-edge probe for {{ $labels.instance }}"
+              description: >-
+                The blackbox prober receives HTTP 429 from Cloudflare for {{ $labels.instance }}
+                while the origin is healthy. This is a Cloudflare rate-limit / WAF condition on
+                the public hostname, not an outage.
+              runbook: >-
+                1. curl -sk https://{{ $labels.instance }}/api/v1/manifests/_schema (expect 200 from a normal client)
+                2. Review Cloudflare rate-limit / WAF rules for the hostname; the 5m-cadence prober is tripping a 429
+                3. Add a Cloudflare rate-limit exception for the prober source IP or the /api/v1/manifests/_schema path
+                4. Confirm whether the singular host update.flowercore.io is still required, or only updates.flowercore.io
+
 # =============================================================================
 # ConfigMap: Blackbox Exporter Configuration
 # =============================================================================