patterns

type Group struct {
	Signature string
	Checks    []string
	// Excerpt is the log the first marker of the group recorded. Every
	// marker of one signature describes the same failure, so one excerpt
	// is enough to build a rule against.
	Excerpt string
	Count   int
	PRs     []string
	// LastSeen is the newest marker of the group.
	LastSeen time.Time
}

type Search struct {
	Client *github.Client
	Org    string
	// Since bounds the search to pull requests updated on or after it, and
	// drops markers written before it. A zero time reads the whole history
	// the search returns.
	Since time.Time
}