【单选题】
A A registry is a protocol to collect TLS keys to secure metrics collection from your application to the Prometheus server.
B Aregistry is a set of exporters to install in your infrastructure to expose metrics
C Aregistry is a set of defined metrics a client library exposes to Prometheus.
D Aregistry is a collection of targets for the same job ,which can be connected to Prometheus using HTTP service discovery
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