How to show data age and missing updates in a dashboard

Dashboard freshness agreement — synthetic worksheet
Decision and panel:
Business owner / exception owner:
Source and required partitions:
Source coverage evidence and limitations:
Last successful import / latest attempt result:
Business time zone and operating hours:
Maximum usable age and exact boundary:
Completeness checks and missing-source rule:
Filters and reporting period:
Last verified result or withheld-total rule:
Warning text / fallback process:
Case | expected display | actual display | pass/fail/not run
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ZenOut Labs | https://zenoutlabs.com/guides/stale-data-operations-dashboard/