503 Service Unavailable on Fastly Magento2 admin endpoints (Edge Dictionary ListAll)
The module's admin XHR calls tripped over Magento Cloud session handling, producing intermittent 503s from Varnish on the Fastly admin endpoints. The Fastly team fixed it in PR #177, released in fastly/magento2 1.2.54. The reporter upgraded to 1.2.54 and confirmed the 503s were gone. Upgrade the fastly/magento2 extens…
Problem outcome: unknown