Merge branch 'update-docs-alert-bot' into 'master'

Add to docs sentence about alertbot opening issues

See merge request gitlab-org/gitlab-ce!28503

(cherry picked from commit 5396b2a8)

afcbebd9 Add to docs sentence about alertbot opening issues

doc/user/project/integrations/prometheus.md

@@ -168,7 +168,7 @@ Alerts can be used to trigger actions, like open an issue automatically. To conf
 1. Optionally, select whether to send an email notification to the developers of the project.
 1. Click **Save changes**.
 
-Once enabled, an issue will be opened automatically when an alert is triggered. To further customize the issue, you can add labels, mentions, or any other supported [quick action](../quick_actions.md) in the selected issue template.
+Once enabled, an issue will be opened automatically when an alert is triggered. The author of the issue will be the GitLab Alert Bot. To further customize the issue, you can add labels, mentions, or any other supported [quick action](../quick_actions.md) in the selected issue template.
 
 If the metric exceeds the threshold of the alert for over 5 minutes, an email will be sent to all [Maintainers and Owners](../../permissions.md#project-members-permissions) of the project.