Tracing — OpenTelemetry coverage matrix, span name conventions, strata.component=gateway|worker filters, sampling.

Web UI (Strata Console) — Embedded operator console: pages, env vars, end-to-end tests.

GC + lifecycle tuning — Tuning STRATA_GC_CONCURRENCY / STRATA_LIFECYCLE_CONCURRENCY and STRATA_GC_SHARDS, plus the dual-write cutover playbook.

Quotas + billingBucketQuota / UserQuota shape, QuotaExceeded 403, the bucket-usage counter, the reconcile + usage-rollup workers.

S3 multi-cluster routingSTRATA_S3_CLUSTERS / STRATA_S3_CLASSES env shape, credentials_ref discriminator, per-class (cluster, bucket) routing, rolling-restart workflow.

Compliance — S3 Object Lock COMPLIANCE workflow, retention modes, legal hold, and the three objectlock:* audit verbs.

Billing — Byte-seconds trapezoid math, intra-day sampling, and the usage_aggregates feed external invoice generators consume.

Production hardening — 12-line checklist for prod readiness: HTTP timeouts, built-in TLS, backend mTLS, trusted proxies, split admin listener, ingress rate limit.

See also#