Notification Cost Attribution: Structured JSON API Logs for Small SaaS

For a small SaaS app, keep one compact, structured delivery outcome per attempt in the searchable logging service, and move verbose diagnostic context out of that tier before shortening retention. The dominant cost is usually determined by multiplication: attempts per day, bytes per event, indexed-field overhead, and retained days. A simple service is one whose bill can be assigned to a tenant, channel, and outcome without putting message bodies or exception dumps into every record. TL;DR: start with a byte budget and an event budget, not a dashboard tour. Preserve the fields needed to count a