Respond 200 when receiving a ping event. (#2492)

plugins/inputs/webhooks/github/github_webhooks.go

@@ -34,9 +34,10 @@ func (gh *GithubWebhook) eventHandler(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
-
+	if e != nil {
 		p := e.NewMetric()
 		gh.acc.AddFields("github_webhooks", p.Fields(), p.Tags(), p.Time())
+	}
 
 	w.WriteHeader(http.StatusOK)
 }
@@ -84,6 +85,8 @@ func NewEvent(data []byte, name string) (Event, error) {
 		return generateEvent(data, &MembershipEvent{})
 	case "page_build":
 		return generateEvent(data, &PageBuildEvent{})
+	case "ping":
+		return nil, nil
 	case "public":
 		return generateEvent(data, &PublicEvent{})
 	case "pull_request":

plugins/inputs/webhooks/github/github_webhooks_test.go

@@ -25,6 +25,10 @@ func TestCommitCommentEvent(t *testing.T) {
 	GithubWebhookRequest("commit_comment", CommitCommentEventJSON(), t)
 }
 
+func TestPingEvent(t *testing.T) {
+	GithubWebhookRequest("ping", "", t)
+}
+
 func TestDeleteEvent(t *testing.T) {
 	GithubWebhookRequest("delete", DeleteEventJSON(), t)
 }