Add documentation for service hook logs

The changes describe how to troubleshoot
project services using service hook logs

doc/integration/jenkins.md

@@ -138,7 +138,7 @@ configured or there was an error reporting the status via the API.
 
 ### Merge Request event does not trigger a Jenkins Pipeline
 
-Check the `/var/log/gitlab/gitlab-rails/production.log` file for messages like:
+Check [service hook logs](../user/project/integrations/project_services.md#troubleshooting-project-services) for request failures or check the `/var/log/gitlab/gitlab-rails/production.log` file for messages like:
 
 ```plaintext
 WebHook Error => Net::ReadTimeout

doc/user/project/integrations/bamboo.md

@@ -55,7 +55,7 @@ service in GitLab.
 ## Troubleshooting
 
 If builds are not triggered, ensure you entered the right GitLab IP address in
-Bamboo under 'Trigger IP addresses'.
+Bamboo under 'Trigger IP addresses'. Also check [service hook logs](project_services.md#troubleshooting-project-services) for request failures.
 
 NOTE: **Note:**
 Starting with GitLab 8.14.0, builds are triggered on push events.

doc/user/project/integrations/bugzilla.md

@@ -26,3 +26,7 @@ We suggest using the longer format if you have both internal and external issue
 
 Please note that `<PROJECT>` part is ignored and links always point to the
 address specified in `issues_url`.
+
+## Troubleshooting
+
+To see recent service hook deliveries, check [service hook logs](project_services.md#troubleshooting-project-services).

doc/user/project/integrations/project_services.md

@@ -20,42 +20,42 @@ Below, you will find a list of the currently supported ones accompanied with com
 
 Click on the service links to see further configuration instructions and details.
 
-| Service | Description |
-| ------- | ----------- |
-| Asana     | Asana - Teamwork without email |
-| Assembla | Project Management Software (Source Commits Endpoint) |
-| [Atlassian Bamboo CI](bamboo.md) | A continuous integration and build server |
-| Buildkite | Continuous integration and deployments |
-| [Bugzilla](bugzilla.md) | Bugzilla issue tracker |
-| Campfire | Simple web-based real-time group chat |
-| Custom Issue Tracker | Custom issue tracker |
-| [Discord Notifications](discord_notifications.md) | Receive event notifications in Discord |
-| Drone CI | Continuous Integration platform built on Docker, written in Go |
-| [Emails on push](emails_on_push.md) | Email the commits and diff of each push to a list of recipients |
-| External Wiki | Replaces the link to the internal wiki with a link to an external wiki |
-| Flowdock | Flowdock is a collaboration web app for technical teams |
-| [Generic alerts](generic_alerts.md) **(ULTIMATE)** | Receive alerts on GitLab from any source |
-| [GitHub](github.md) **(PREMIUM)** | Sends pipeline notifications to GitHub |
-| [Hangouts Chat](hangouts_chat.md) | Receive events notifications in Google Hangouts Chat |
-| [HipChat](hipchat.md) | Private group chat and IM |
-| [Irker (IRC gateway)](irker.md) | Send IRC messages, on update, to a list of recipients through an Irker gateway |
-| [Jira](jira.md) | Jira issue tracker |
-| [Jenkins](../../../integration/jenkins.md) **(STARTER)** | An extendable open source continuous integration server |
-| JetBrains TeamCity CI | A continuous integration and build server |
-| [Mattermost slash commands](mattermost_slash_commands.md) | Mattermost chat and ChatOps slash commands |
-| [Mattermost Notifications](mattermost.md) | Receive event notifications in Mattermost |
-| [Microsoft teams](microsoft_teams.md) |  Receive notifications for actions that happen on GitLab into a room on Microsoft Teams using Office 365 Connectors |
-| Packagist | Update your project on Packagist, the main Composer repository |
-| Pipelines emails | Email the pipeline status to a list of recipients |
-| [Slack Notifications](slack.md) | Send GitLab events (e.g. issue created) to Slack as notifications |
-| [Slack slash commands](slack_slash_commands.md) **(CORE ONLY)** | Use slash commands in Slack to control GitLab |
-| [GitLab Slack application](gitlab_slack_application.md) **(FREE ONLY)** | Use Slack's official application |
-| PivotalTracker | Project Management Software (Source Commits Endpoint) |
-| [Prometheus](prometheus.md) | Monitor the performance of your deployed apps |
-| Pushover | Pushover makes it easy to get real-time notifications on your Android device, iPhone, iPad, and Desktop |
-| [Redmine](redmine.md) | Redmine issue tracker |
-| [Unify Circuit](unify_circuit.md) | Receive events notifications in Unify Circuit |
-| [YouTrack](youtrack.md) | YouTrack issue tracker |
+| Service | Description | Service Hooks |
+| ------- | ----------- | ------------- |
+| Asana     | Asana - Teamwork without email | No |
+| Assembla | Project Management Software (Source Commits Endpoint) | No |
+| [Atlassian Bamboo CI](bamboo.md) | A continuous integration and build server | Yes |
+| Buildkite | Continuous integration and deployments | Yes |
+| [Bugzilla](bugzilla.md) | Bugzilla issue tracker | No |
+| Campfire | Simple web-based real-time group chat | No |
+| Custom Issue Tracker | Custom issue tracker | No |
+| [Discord Notifications](discord_notifications.md) | Receive event notifications in Discord | No |
+| Drone CI | Continuous Integration platform built on Docker, written in Go | Yes |
+| [Emails on push](emails_on_push.md) | Email the commits and diff of each push to a list of recipients | No |
+| External Wiki | Replaces the link to the internal wiki with a link to an external wiki | No |
+| Flowdock | Flowdock is a collaboration web app for technical teams | No |
+| [Generic alerts](generic_alerts.md) **(ULTIMATE)** | Receive alerts on GitLab from any source | No |
+| [GitHub](github.md) **(PREMIUM)** | Sends pipeline notifications to GitHub | No |
+| [Hangouts Chat](hangouts_chat.md) | Receive events notifications in Google Hangouts Chat | No |
+| [HipChat](hipchat.md) | Private group chat and IM | No |
+| [Irker (IRC gateway)](irker.md) | Send IRC messages, on update, to a list of recipients through an Irker gateway | No |
+| [Jira](jira.md) | Jira issue tracker | No |
+| [Jenkins](../../../integration/jenkins.md) **(STARTER)** | An extendable open source continuous integration server | Yes |
+| JetBrains TeamCity CI | A continuous integration and build server | Yes |
+| [Mattermost slash commands](mattermost_slash_commands.md) | Mattermost chat and ChatOps slash commands | No |
+| [Mattermost Notifications](mattermost.md) | Receive event notifications in Mattermost | No |
+| [Microsoft teams](microsoft_teams.md) |  Receive notifications for actions that happen on GitLab into a room on Microsoft Teams using Office 365 Connectors | No |
+| Packagist | Update your project on Packagist, the main Composer repository | Yes |
+| Pipelines emails | Email the pipeline status to a list of recipients | No |
+| [Slack Notifications](slack.md) | Send GitLab events (e.g. issue created) to Slack as notifications | No |
+| [Slack slash commands](slack_slash_commands.md) **(CORE ONLY)** | Use slash commands in Slack to control GitLab | No |
+| [GitLab Slack application](gitlab_slack_application.md) **(FREE ONLY)** | Use Slack's official application | No |
+| PivotalTracker | Project Management Software (Source Commits Endpoint) | No |
+| [Prometheus](prometheus.md) | Monitor the performance of your deployed apps | No |
+| Pushover | Pushover makes it easy to get real-time notifications on your Android device, iPhone, iPad, and Desktop | No |
+| [Redmine](redmine.md) | Redmine issue tracker | No |
+| [Unify Circuit](unify_circuit.md) | Receive events notifications in Unify Circuit | No |
+| [YouTrack](youtrack.md) | YouTrack issue tracker | No |
 
 ## Push hooks limit
 
@@ -74,6 +74,25 @@ your liking which will then be pre-filled on each project's Service.
 
 Read more about [Services templates in this document](services_templates.md).
 
+## Troubleshooting project services
+
+Some project services use service hooks for integration with external applications. To confirm which ones use service hooks, see the [services table](#services). GitLab stores details of service hook requests made within the last 2 days. To view details of the requests, go to the service's configuration page.
+
+The **Recent Deliveries** section lists the details of each request made within the last 2 days:
+
+- HTTP status code (green for 200-299 codes, red for the others, `internal error` for failed deliveries)
+- Triggered event
+- URL to which the request was sent
+- Elapsed time of the request
+- Relative time in which the request was made
+
+To view more information about the request's execution, click the respective **View details** link.
+On the details page, you can see the data sent by GitLab (request headers and body) and the data received by GitLab (response headers and body).
+
+From this page, you can repeat delivery with the same data by clicking **Resend Request**.
+
+![Recent deliveries](img/webhook_logs.png)
+
 ## Contributing to project services
 
 Because GitLab is open source we can ship with the code and tests for all