18 August 2026 · Resolved
+Candidate B production availability incident
++ A production storage upgrade caused customer-visible interruptions while + the service was moved to a new release. +
+Customer impact
++ On 17–18 August, reads and writes through mdbase hosted storage, Connect, + and MCP were unavailable during two UTC windows: 23:37:04–23:45:17 on 17 + August, and 23:51:38 on 17 August–04:15:16 on 18 August. Requests returned + 503 responses. The first window is conservatively measured through the + completed restoration, and the second ends when normal authenticated reads + and writes resumed. +
++ The release also caused two narrower hosted-storage interruptions on 18 + August: approximately 09:2x–09:44 UTC (about 20 minutes), and + 11:49:00–11:49:33 UTC. Hosted collection operations returned 502 responses; + Connect and MCP remained available during the second interruption. +
+ +Data integrity
++ No canonical encrypted records were lost or rewritten. Exact Markdown + remained the authoritative copy throughout recovery. Projection integrity + was verified after the upgrade, and authenticated record and file + write-read-delete checks passed after service restoration. There was no + identified confidentiality impact. +
+ +Correction
++ The rollout was completed using durable progress checkpoints and additional + verification before traffic reopened. Deployment checks were corrected so + a closed service is tested for liveness rather than readiness. The later + hosted-storage defect was fixed by keeping unaffected projections current + when a saved view changes and by preventing one degraded collection from + withdrawing the whole provider. Future storage migrations require measured + production-shape rehearsals, a bounded outage decision, resumable recovery + testing, and independent post-deployment read/write checks. +
+ +Beta service
++ Connect remains a beta service with no availability SLA. This permanent + summary records how a beta failure affected customers and what changed; it + is not an uptime commitment. Current conditions are published on the + service status page. +
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