Distinguish no failures from no telemetry.

Instruction: Interpret the dashboard and design separate checks for service health and measurement health.

Context:

A fictional dashboard shows zero errors after a metrics collector stopped scraping. Both request and error series have disappeared. A ratio panel turns missing values into zero. One external synthetic request still succeeds, but it tests only the home page.

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I would mark the service ratio unknown, not healthy. Missing numerator and denominator are not evidence of zero failed requests...

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