NewService creates a new scraper service.

Config is the scraper configuration.

Pair is the linked discovery/scraper pair.

Service represents the scraper manager.

ServiceAppenderAdapter exposes the service's Append method, but hides the Commit method used by the registry to commit config.

Prometheus logger.

Discoverer represents a service that discovers hosts to scrape.

Registry represents the combined configuration state of discoverers and scrapers.