OneDeploy 503 Service Unavailable on Linux Python App Service for >24h, post-auth, multiple unrelated commits

[nxfwapd]

Summary

GitHub Actions deploys via azure/webapps-deploy@v3 to a Linux Python 3.11 App Service have been failing with HTTP 503 from OneDeploy for over 24 hours, across multiple unrelated commits. SCM auth layer responds normally; the 503 happens post-authentication, deeper in the OneDeploy/Kudu pipeline.

Environment

• App Service name: wapd-image-finder
• Runtime: Linux Python 3.11
• Deploy method: GitHub Actions OIDC -> azure/webapps-deploy@v3 -> OneDeploy (zip)
• Region: East US
• Date range observed: 2026-05-08 through 2026-05-09 UTC

Symptoms

• Build step succeeds.
• Deploy step calls OneDeploy with a valid OAuth token.
• Response: HTTP 503 Service Unavailable.
• Failure log:

  Failed to deploy web package using OneDeploy to App Service.
  Service Unavailable (CODE: 503)
  

• Initial failures (2026-05-09 ~04:45 UTC): fast 503 returned in ~1m36s.
• Latest failure (2026-05-09 ~20:43 UTC): ~6 min stall between "Deployment Step Started" and "Package deployment using OneDeploy initiated", then 503.

Diagnostic data ruling out customer-side cause

• curl -I https://wapd-image-finder.scm.azurewebsites.net/ -> 401 (auth challenge, expected, fast).
• curl -I https://wapd-image-finder.scm.azurewebsites.net/api/publish -> 401 (reachable).
• curl -I https://wapd-image-finder.scm.azurewebsites.net/api/zipdeploy -> 401 (reachable).
• Same workflow + OIDC config has succeeded multiple times prior to 2026-05-08.
• Three different commits failing the same way, none of which touch infrastructure or deploy config.

Ask

• Is OneDeploy currently degraded for Linux Python in East US?
• Is there a documented alternate deploy path recommended while OneDeploy is recovering (e.g., az webapp deploy --type zip direct, Kudu zipdeploy via REST)?
• Acknowledgment so we can correlate against any in-flight Microsoft incident ticket.

Filing this as an audit-trail issue. Will update with resolution once OneDeploy clears.