Lineage granularity is a per-source property, not a platform property. Promising column-level lineage across an estate that cannot supply it is the single most common way these programmes lose credibility.
Coverage is published on every asset profile, so a consumer sees the strength of the evidence alongside the answer.
Declared gaps
No usage metadata from SaaS applications and no quality results from BI or streaming — those systems do not expose them.
SaaS and file sources are manual-lineage only at go-live. They are the first candidates for the declarative lineage API.
Assumption
Warehouse access-history retention is at least 90 days, which is what column-level lineage inference from query logs requires (view 11).
