The observation policy was too permissive to report anything; it is now strict, with a liveness marker that distinguishes “clean” from “nothing is arriving”.
Strict Observation Policy and Sink Liveness Marker
The report-only policy permitted every external host, so it reported nothing and the empty violation table read as “the policy is clean” when it meant “the policy asks nothing”. It is now a strict measurement policy, and a liveness marker distinguishes a genuinely clean result from a reporting pipeline that is not delivering — the exact ambiguity the monitor exists to end.