Documentation
What this service measures, what its verdicts mean, and what it did to your server.
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Metrics
The eight things this service asks an endpoint, what each question is, and what an answer to it does and does not establish.
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States
The seven verdicts a measurement can carry, what each one means, and how each is drawn without relying on colour.
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Monitoring
Who queried your server, how often, how politely, why that endpoint, and how to ask to be left alone. This page keeps its own address because every request this service makes carries it.
Every page here is served as HTML for a reader and as Turtle, N-Triples, RDF/XML or JSON-LD for a program, which is this site's rule for every resource it has. The metric and state pages carry their facts in the data and their explanations only in the prose, because an explanation is for a person and a paragraph is not something a consumer should be invited to parse.