prow/tide/status.go
func expectedStatus(queryMap *config.QueryMap, pr *PullRequest, pool map[string]PullRequest, cc contextChecker) (string, string) {
	if _, ok := pool[prKey(pr)]; !ok {
		minDiffCount := -1
		var minDiff string
		for _, q := range queryMap.ForRepo(string(pr.Repository.Owner.Login), string(pr.Repository.Name)) {
			diff, diffCount := requirementDiff(pr, &q, cc)
			if minDiffCount == -1 || diffCount < minDiffCount {
				minDiffCount = diffCount
				minDiff = diff
			}
		}
		return github.StatusPending, fmt.Sprintf(statusNotInPool, minDiff)
	}
	return github.StatusSuccess, statusInPool
}
func expectedStatus(queryMap *config.QueryMap, pr *PullRequest, pool map[string]PullRequest, cc contextChecker) (string, string) {
	if _, ok := pool[prKey(pr)]; !ok {
		minDiffCount := -1
		var minDiff string
		for _, q := range queryMap.ForRepo(string(pr.Repository.Owner.Login), string(pr.Repository.Name)) {
			diff, diffCount := requirementDiff(pr, &q, cc)
			if minDiffCount == -1 || diffCount < minDiffCount {
				minDiffCount = diffCount
				minDiff = diff
			}
		}
		return github.StatusPending, fmt.Sprintf(statusNotInPool, minDiff)
	}
	return github.StatusSuccess, statusInPool
}
// Returns expected status state and description.
// If a PR is not mergeable, we have to select a TideQuery to compare it against
// in order to generate a diff for the status description. We choose the query
// for the repo that the PR is closest to meeting (as determined by the number
// of unmet/violated requirements).