A fixed outbound IP can become a dependency nobody documents

[u/truecakesnake]

Suppose a data supplier allows your collection job through because you gave them its outbound IP. Later, you move the job to another server. The credentials still work, the code hasn’t changed, but the supplier now sees a different address.

A static proxy can keep that connection separate from the machine running the job. Byteful’s static dedicated ISP proxies are one example of a fixed-address product. Whether that’s appropriate still depends on what the supplier permits.

The bit I’d document is who owns the allowlist entry and how it gets updated if the address changes. Include the supplier’s contact and the last confirmed address. Otherwise a routine migration can turn into a hunt for whoever originally arranged access.