Add article about handling failed webhook deliveries (#42956)

Co-authored-by: Jess Hosman <1183847+jhosman@users.noreply.github.com>

content/webhooks/testing-and-troubleshooting-webhooks/redelivering-webhooks.md

@@ -12,7 +12,7 @@ topics:
 
 ## About redelivering webhooks
 
-You may want to redeliver a webhook to help you test your application or to recover from server downtime. You can redeliver webhook deliveries that occurred in the past 30 days.
+You may want to redeliver a webhook to help you test your application or to recover from server downtime. You can redeliver webhook deliveries that occurred in the past 30 days. {% data variables.product.company_short %} does not automatically redeliver failed deliveries.
 
 ## Redelivering repository webhooks
 
@@ -91,8 +91,6 @@ Only the owner of the sponsored account can redeliver sponsorship webhooks for t
 
 Only enterprise owners can redeliver webhooks in that enterprise.
 
-{% ifversion  ghes or ghae %}You can use the {% data variables.product.company_short %} web interface or the REST API to redeliver global webhooks. For more information about using the REST API to redeliver webhooks, see "[AUTOTITLE](/rest/enterprise-admin/global-webhooks)."{% endif %}
-
 {% data reusables.enterprise-accounts.access-enterprise %}
 {% data reusables.enterprise-accounts.settings-tab %}
 {% data reusables.enterprise-accounts.hooks-tab %}

content/webhooks/testing-and-troubleshooting-webhooks/viewing-webhook-deliveries.md

@@ -93,8 +93,6 @@ Only the owner of the sponsored account can view deliveries for sponsorship webh
 
 Only enterprise owners can view deliveries for webhooks in that enterprise.
 
-{% ifversion  ghes or ghae %}You can use the {% data variables.product.company_short %} web interface or the REST API to view recent deliveries for global webhooks. For more information about using the REST API to view recent deliveries, see "[AUTOTITLE](/rest/enterprise-admin/global-webhooks)."{% endif %}
-
 {% data reusables.enterprise-accounts.access-enterprise %}
 {% data reusables.enterprise-accounts.settings-tab %}
 {% data reusables.enterprise-accounts.hooks-tab %}

content/webhooks/using-webhooks/handling-failed-webhook-deliveries.md

@@ -0,0 +1,33 @@
+---
+title: Handling failed webhook deliveries
+shortTitle: Handling failed deliveries
+intro: '{% data variables.product.company_short %} does not automatically redeliver failed webhook deliveries, but you can handle failed deliveries manually or by writing code.'
+versions:
+  fpt: '*'
+  ghes: '*'
+  ghae: '*'
+  ghec: '*'
+topics:
+  - Webhooks
+---
+
+## About webhook delivery failures
+
+A webhook delivery can fail for multiple reasons. For example, if your server is down or takes longer than {% ifversion fpt or ghec %}10{% else %}30{% endif %} seconds to respond, {% data variables.product.company_short %} will record the delivery as a failure.
+
+{% data variables.product.company_short %} does not automatically redeliver failed deliveries.
+
+## Handling delivery failures
+
+You can manually redeliver failed deliveries. For more information, see "[AUTOTITLE](/webhooks/testing-and-troubleshooting-webhooks/redelivering-webhooks)."
+
+You can also write a script that checks for failed deliveries and attempts to redeliver any that failed. Your script should run on a schedule and do the following:
+
+- Use the {% data variables.product.company_short %} REST API to fetch data about any webhook deliveries that were attempted since the last time that your script ran. For more information, see "[AUTOTITLE](/rest/webhooks/repo-deliveries#list-deliveries-for-a-repository-webhook)," "[AUTOTITLE](/rest/orgs/webhooks#list-deliveries-for-an-organization-webhook)," and "[AUTOTITLE](/rest/apps/webhooks#list-deliveries-for-an-app-webhook)."
+
+   {% ifversion fpt %}There are no API endpoints to get data about {% data variables.product.prodname_marketplace %} webhooks or {% data variables.product.prodname_sponsors %} webhooks.{% endif %}{% ifversion ghec %}There are no API endpoints to get data about {% data variables.product.prodname_marketplace %} webhooks, {% data variables.product.prodname_sponsors %} webhooks, or global webhooks.{% endif %}{% ifversion ghes or ghae %}There are no API endpoints to get data about global webhook deliveries.{% endif %}
+
+- Look at the fetched data to see if any deliveries failed. The data for a failed delivery will have a `status` value that is not `OK`.
+- Use the {% data variables.product.company_short %} REST API to redeliver any deliveries that failed. For more information, see "[AUTOTITLE](/rest/webhooks/repo-deliveries#redeliver-a-delivery-for-a-repository-webhook)," "[AUTOTITLE](/rest/orgs/webhooks#redeliver-a-delivery-for-an-organization-webhook)," and "[AUTOTITLE](/rest/apps/webhooks#redeliver-a-delivery-for-an-app-webhook)."
+
+If a webhook delivery fails repeatedly, you should investigate the cause. Each failed delivery will give a reason for failure. For example, if the delivery failure indicates that {% data variables.product.company_short %} couldn't connect to the host, you should verify that the domain portion of the webhook URL that you specified resolves to an IP address.

content/webhooks/using-webhooks/index.md

@@ -12,6 +12,7 @@ children:
   - /creating-webhooks
   - /handling-webhook-deliveries
   - /securing-your-webhooks
+  - /handling-failed-webhook-deliveries
   - /disabling-webhooks
   - /best-practices-for-using-webhooks
 ---