Varisai Makes the Message Key Do the Hard Work

Field notes

Varisai models concurrency as independent per-key lanes rather than as a fixed partition arrangement. Its documented controls include maximum retry attempts, jittered exponential backoff, per-attempt leases, dead-letter redrive, scheduled delivery, and replay by offset or timestamp. The homepage gives both a curl publish example and a JavaScript consumer example, and says a failed message blocks only its own key lane. A dashboard is presented for tracing attempts, pausing lanes, and inspecting failures.