Interface SchedulerDiagnosticsSnapshot

One scheduler source's snapshot (M98k): the observations its owned SchedulerService and executor made.

coverage is always owned-instance: the source describes the service its own plugin created — including if that service was later replaced under the scheduler token, which the source does not observe; a custom replacement's behavior is never represented. alias is the configured SOURCE alias, null exactly when the plugin was not opted into observation (state: 'disabled'); a record's alias is the approved JOB alias, a different namespace. At most 64 (job alias, operation) records are retained; dropped counts observations for which no slot was free (saturating). A collection failure clears records and reports collection-failed carrying no records.