Webhook delivery metrics

[nikolaik]

Hi there, just wanted to hear if there is any interest in adding support for metrics for webhook deliveries

Example webhook delivery shape:

{
  "id": 12345678,
  "guid": "0b989ba4-242f-11e5-81e1-c7b6966d2516",
  "delivered_at": "2019-06-03T00:57:16Z",
  "redelivery": false,
  "duration": 0.27,
  "status": "OK",
  "status_code": 200,
  "event": "issues",
  "action": "opened",
  "installation_id": 123,
  "repository_id": 456,
  "throttled_at": "2019-06-03T00:57:16Z"
}

These can be pulled from multiple APIs depending on the level of integration

• /repos/{owner}/{repo}/hooks/{hook_id}/deliveries
• /orgs/{org}/hooks/{hook_id}/deliveries

Would need a separate GET request to list the webhooks by org or repo first

• /repos/{owner}/{repo}/hooks
• /orgs/{org}/hooks