Allows users to change the default label

Some people are restricted by their orgs to need something other than
alert:boom:

cmd/github_receiver/main.go

@@ -40,6 +40,7 @@ var (
 	enableAutoClose = flag.Bool("enable-auto-close", false, "Once an alert stops firing, automatically close open issues.")
 	enableInMemory  = flag.Bool("enable-inmemory", false, "Perform all operations in memory, without using github API.")
 	receiverPort    = flag.String("port", "9393", "The port for accepting alertmanager webhook messages.")
+	alertLabel      = flag.String("alertlabel", "alert:boom:", "The default label applied to all alerts")
 	extraLabels     = flag.StringArray("label", nil, "Extra labels to add to issues at creation time.")
 )
 
@@ -106,7 +107,7 @@ func main() {
 	if *enableInMemory {
 		client = local.NewClient()
 	} else {
-		client = issues.NewClient(*githubOrg, token)
+		client = issues.NewClient(*githubOrg, token, *alertLabel)
 	}
 	serveReceiverHandler(client)
 }

issues/issues.go

@@ -84,36 +84,39 @@ type Client struct {
 	GithubClient *github.Client
 	// org is the github user or organization name (e.g. github.com/<org>/<repo>).
 	org string
+	// alertLabel is the label applied to all alerts.
+	alertLabel string
 }
 
 // NewClient creates an Client authenticated using the Github authToken.
 // Future operations are only performed on the given github "org/repo".
-func NewClient(org, authToken string) *Client {
+func NewClient(org, authToken, alertLabel string) *Client {
 	ctx := context.Background()
 	tokenSource := oauth2.StaticTokenSource(
 		&oauth2.Token{AccessToken: authToken},
 	)
 	client := &Client{
 		GithubClient: github.NewClient(oauth2.NewClient(ctx, tokenSource)),
 		org:          org,
+		alertLabel:   alertLabel,
 	}
 	return client
 }
 
 // CreateIssue creates a new Github issue. New issues are unassigned. Issues are
-// labeled with with an alert named "alert:boom:". Labels are created automatically
+// labeled with with an alert named alertLabel. Labels are created automatically
 // if they do not already exist in a repo.
 func (c *Client) CreateIssue(repo, title, body string, extra []string) (*github.Issue, error) {
 	labels := make([]string, len(extra)+1)
-	labels[0] = "alert:boom:"
+	labels[0] = c.alertLabel
 	for i := range extra {
 		labels[i+1] = extra[i]
 	}
 	// Construct a minimal github issue request.
 	issueReq := github.IssueRequest{
 		Title:  &title,
 		Body:   &body,
-		Labels: &labels, // Search using: label:"alert:boom:"
+		Labels: &labels, // Search using: label:alertLabel
 	}
 
 	// Enforce a timeout on the issue creation.
@@ -151,9 +154,9 @@ func (c *Client) ListOpenIssues() ([]*github.Issue, error) {
 		// number of "closed" issues. By only listing "open" issues we limit the
 		// number of issues returned.
 		//
-		// The search depends on all relevant issues including the "alert:boom:" label.
+		// The search depends on all relevant issues including the alertLabel label.
 		issues, resp, err := c.GithubClient.Search.Issues(
-			ctx, `is:issue in:title is:open org:`+c.org+` label:"alert:boom:"`, sopts)
+			ctx, `is:issue in:title is:open org:`+c.org+` label:"`+c.alertLabel+`"`, sopts)
 		updateRateMetrics("search", resp, err)
 		if err != nil {
 			log.Printf("Failed to list open github issues: %v\n", err)

issues/issues_test.go

@@ -59,7 +59,7 @@ func teardownServer() {
 }
 
 func TestCreateIssue(t *testing.T) {
-	client := issues.NewClient("fake-owner", "FAKE-AUTH-TOKEN")
+	client := issues.NewClient("fake-owner", "FAKE-AUTH-TOKEN", "alert:boom:")
 	client.GithubClient.BaseURL = setupServer()
 	defer teardownServer()
 
@@ -98,7 +98,7 @@ func TestCreateIssue(t *testing.T) {
 }
 
 func TestListOpenIssues(t *testing.T) {
-	client := issues.NewClient("owner", "FAKE-AUTH-TOKEN")
+	client := issues.NewClient("owner", "FAKE-AUTH-TOKEN", "alert:boom:")
 	// Override public github API with local server.
 	client.GithubClient.BaseURL = setupServer()
 	defer teardownServer()
@@ -125,7 +125,7 @@ func TestListOpenIssues(t *testing.T) {
 }
 
 func TestCloseIssue(t *testing.T) {
-	client := issues.NewClient("owner", "FAKE-AUTH-TOKEN")
+	client := issues.NewClient("owner", "FAKE-AUTH-TOKEN", "alert:boom:")
 	client.GithubClient.BaseURL = setupServer()
 	defer teardownServer()