Customer 360 Enterprise Data Platform — Denodo on Azure  ·  View 25 of 39  ·  Runtime

When a Source Goes Down

The degradation path, drawn across all four parties, from healthy through to recovery.

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Healthy Detect Degrade Inform Recover Source ServiceNow responding Latency past 3 s Errors above 25% Vendor incident open Probe succeeds Denodo Full 360 assembled Timeout at 3 s Circuit opens Partial result built Per-domain status set Half-open retry Consumer Every panel populated No visible change Support panel greyed Cases unavailable, 09:14 Panel repopulates Operator Source SLO green Alert on error budget Runbook opened Status page updated Post-incident review When a Source Goes Down — Partial, Labelled, and Never Silent This is the answer to the agent journey's worst moment. An empty panel and an unreachable source must never look the same, so the contract carries a status per domain rather than one status per response. v 1.0 · owner Data & AI Global Practice · date 2026-09

The design rule

  • An empty panel and an unreachable source must never look the same. Everything else on this page follows from that one sentence.
  • The circuit opens on error rate rather than on a single timeout, so a slow query does not remove a working source from the 360.
  • Graceful degradation is per domain. Losing ServiceNow costs the support panel and nothing else; the profile, orders and value panels are unaffected.

Numbers

  • Source timeout 3 s; circuit opens above 25% errors in a 60-second window; half-open retry after 30 seconds.
  • The consumer sees a timestamped notice, so an agent can tell a customer how current the information they do have is.

Assumptions

  • Every source has a health probe that is independent of the query path; a source that only looks healthy because queries are succeeding cannot be trusted during an incident.
  • Vendor status pages are not on the critical path of detection.
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Solution Architecture v1.0 · Data & AI Global Practice · 2026-09 · 39 views · Denodo Platform, Microsoft Azure and open source25-source-outage-degradation