Reviewed 8 August 2026 · Omnivision Pro product documentation
Partial, Stale, Unavailable and zero are different states
Zero is a real measured value; Partial, Stale and Unavailable describe evidence quality or access.
Answer first
Why must unavailable data never be displayed as zero?
Zero is a real measured value; Partial, Stale and Unavailable describe evidence quality or access.
The review should preserve the source, scope and data state alongside the conclusion so another operator can understand what supports the decision.
Evidence to retain
Keep the decision connected to these signals.
Source coverage
Record its source, coverage and current state before interpretation.
Last successful retrieval
Record its source, coverage and current state before interpretation.
Requested versus returned scope
Record its source, coverage and current state before interpretation.
Explicit measured value when zero is shown
Record its source, coverage and current state before interpretation.
Practical workflow
Preserve the source state.
Keep the result reviewable before moving to the next stage.
Show freshness and coverage.
Keep the result reviewable before moving to the next stage.
Block unsupported conclusions.
Keep the result reviewable before moving to the next stage.
Decision questions
Ask before approving a change.
- Is the evidence complete enough for this conclusion?
- Is the source current for the decision window?
- Is zero measured or merely absent?
Common failure modes
Do not let missing context become certainty.
- Coercing null or missing values to zero
- Suppressing stale-state context
- Averaging across incomplete scopes without disclosure