prow/github/client.go
func (c *Client) GetIssueLabels(org, repo string, number int) ([]Label, error) {
	c.log("GetIssueLabels", org, repo, number)
	return c.getLabels(fmt.Sprintf("/repos/%s/%s/issues/%d/labels", org, repo, number))
}
func (c *Client) GetIssueLabels(org, repo string, number int) ([]Label, error) {
	c.log("GetIssueLabels", org, repo, number)
	return c.getLabels(fmt.Sprintf("/repos/%s/%s/issues/%d/labels", org, repo, number))
}
// GetIssueLabels returns the list of labels currently on issue org/repo#number.
//
// See https://developer.github.com/v3/issues/labels/#list-labels-on-an-issue