This function is placed in this package to avoid circular dependency between the fork and the query package.

TODO "ignore-header-change".

ConsoleBoxOutputTestMode is a flag used by tests to suppress initialization routines that are not testable.

ConsoleBoxSink implements the SampleSink interface by printing the received samples to the standard out.

Decouple the incoming samples from the MetricSink through a looping goroutine and a channel.

Can tolerate multiple headers, fills missing data up with default values.

PrometheusMarshaller marshals Headers and Samples to the prometheus exposition format.

Sort based on given Tags, use Timestamp as last sort criterion.

This processor copies tags from a "reference" sample stream to a number of "target" sample streams.