How would you handle the allowlisting process for intentionally-public S3 buckets so it doesn't become its own source of friction or forgotten debt?

Make adding to the allowlist a fast, self-service, but tracked process (a tagged bucket plus a lightweight, logged justification, not a slow manual ticket), and pair it with a periodic, automated review that flags allowlist entries for buckets that no longer exist, haven't been accessed in a long time, or are due for their scheduled re-justification — treating the allowlist as a living, owned artifact rather than a write-once, never-revisited list.

Fast, self-service addition avoids blocking legitimate new use cases: if creating a new, genuinely-public bucket (a new static site, a new public dataset) requires a slow manual process to get allowlisted, teams will either be blocked unnecessarily or find a workaround that bypasses the allowlist entirely (defeating its purpose). A lightweight process — tagging the bucket with a specific marker and a brief, required justification field, self-service but still creating a tracked record — keeps the friction low while still requiring deliberate intent, avoiding both extremes (too slow, or no real check at all).

Every addition creates a durable, reviewable record: even though adding to the allowlist is fast, each addition should log who added it, when, and why — this is what prevents the allowlist from becoming an opaque, unaccountable list nobody can explain later, even though the addition process itself is quick.

Periodic automated review catches staleness: a scheduled check (monthly or quarterly) that flags allowlist entries where the bucket no longer exists (deleted but the allowlist entry wasn't cleaned up), hasn't been accessed in an unusually long time (suggesting it may no longer actually need to be public), or is past a defined re-justification date, surfaces exactly the kind of forgotten debt a write-once allowlist accumulates — turning "someone eventually notices this seems wrong" into a routine, automated check.

Require periodic re-justification for long-lived entries, not just at creation: a bucket allowlisted as "deliberately public" two years ago might no longer actually need to be — requiring the original justification to be re-confirmed (or updated) on a defined schedule (annually, say) keeps the allowlist reflecting genuinely current, still-valid reasons, rather than accumulating entries that were true once but are now stale.

Assign clear ownership for the allowlist itself: someone (a specific team, not "whoever happens to notice") needs to own reviewing the periodic staleness reports and following up on flagged entries — without clear ownership, even a well-designed automated review process just generates reports nobody acts on, recreating the same staleness problem one layer up.

• Fast, self-service allowlist addition (tagged bucket plus a brief required justification) avoids blocking legitimate new public buckets while still requiring deliberate intent.
• Every addition should create a durable, logged record (who, when, why) even though the process itself is quick.
• A periodic automated review flagging deleted buckets, long-unaccessed entries, or entries due for re-justification catches staleness before it silently accumulates.
• Clear ownership of reviewing and acting on staleness reports is necessary, or even a well-designed review process just generates unread reports.

• AWS: Blocking public access to your Amazon S3 storage