A dependency ownership map is a table that lists each shared internal library with its owning team, tier, supported versions, consumers and last review date. Build it from your inventory, keep it next to the code, and use it to route alerts and decide who acts.
Why a map
Alerts need a destination. Without a map, a vulnerability in a shared library goes to whichever team the scanner guesses, or to a shared inbox where it stays. A map turns "who owns this?" from a thread into a lookup.
The columns
| Column | Content | Source |
|---|---|---|
| Library | Name and registry location | Inventory |
| Owner team | One team | Catalog owner field, CODEOWNERS |
| Maintainers | Two or more people | Team roster |
| Tier | Critical, standard or low | Your criteria |
| Supported versions | Rule in one line | README |
| Consumers | Count and link to list | Dependency graph, SBOMs |
| Last reviewed | Date | Owner |
| Contact | Queue | Owner |
Tier criteria
Pick three tiers and write the criteria down. For example, critical if the library touches authentication, cryptography, payments or untrusted input, or has more than a set number of consumers. Tier decides review depth, number of required approvers and the service level.
How to build it in a week
- Day 1. Export libraries from your registry and your catalog.
- Day 2. Pull consumer counts from lockfiles or SBOMs.
- Day 3. Assign owners. Where a library has none, put "unowned" and start the process from orphaned shared libraries.
- Day 4. Fill tiers and supported versions with the owners.
- Day 5. Publish and wire it into alert routing.
Keep it alive
A map that is edited by hand decays. Generate what you can: owners from the catalog, consumers from the graph. Ask owners to confirm the rest twice a year. Backstage describes the owner as the entity with ultimate responsibility and the authority to maintain the component, which is a useful test when you review rows: could this team actually ship a fix?
Checks to run
| Check | Failure means |
|---|---|
| Owner team still exists | Handover needed |
| Maintainers fewer than two | Bus factor risk |
| Review date older than a year | Stale row |
| Critical tier with unowned status | Escalate now |
Safeguard can help with the inventory side: its SBOM and dependency scanning shows which services pull in a given internal library, and you can run a free scan at gold.safeguard.sh/scan.
Quick check
Do we list external packages in the map?
No. This map is for shared internal libraries. Track external packages in your SBOMs and inventory.
Who maintains the map?
A platform or engineering enablement function, with each owner confirming their rows.
Sources
Last reviewed: 19 October 2026.
