New matchers in the Alertmanager config and silences
summary
Alertmanager now uses new matcher objects for silences, routing and inhibition that replace many old config flags and work as short and long form matchers. Matchers support negative matching (for example match anything-but production or a blackhole receiver), accept equality and combined forms for label strings, and are inherited down the routing tree so children can skip matched alerts (inheritance through route tree). Examples show updated silence creation and simpler, consistent UI and config.
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