Add docs for alert management list

changelogs/unreleased/216243.yml

+---
+title: Add docs for alert management list
+merge_request: 31225
+author:
+type: other

doc/user/project/operations/alert_management.md

+# Alert Management
+
+> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2877) in GitLab 13.0.
+
+Alert Management enables developers to easily discover and view the alerts
+generated by their application. By surfacing alert information where the code is
+being developed, efficiency and awareness can be increased.
+
+## Enable Alert Management
+
+NOTE: **Note:**
+You will need at least Maintainer [permissions](../../permissions.md) to enable the Alert Management feature.
+
+1. Follow the [instructions for toggling generic alerts](../integrations/generic_alerts.md#setting-up-generic-alerts)
+1. You can now visit **{cloud-gear}** **Operations > Alert Management** in your project's sidebar to [view a list](#alert-management-list) of alerts.
+
+![Alert Management Toggle](img/alert_management_1_v13_1.png)
+
+## Alert Management severity
+
+Each level of alert contains a uniquely shaped and color-coded icon to help
+you identify the severity of a particular alert. These severity icons help you
+immediately identify which alerts you should prioritize investigating:
+
+![Alert Management Severity System](img/alert_management_severity_v13_0.png)
+
+Alerts contain one of the following icons:
+
+- **Critical**: **{severity-critical}** and hexadecimal color `#8b2615`
+- **High**: **{severity-high}** and hexadecimal color `#c0341d`
+- **Medium**: **{severity-medium}** and hexadecimal color `#fca429`
+- **Low**: **{severity-low}** and hexadecimal color `#fdbc60`
+- **Info**: **{severity-info}** and hexadecimal color `#418cd8`
+- **Unknown**: **{severity-unknown}** and hexadecimal color `#bababa`
+
+## Alert Management list
+
+NOTE: **Note:**
+You will need at least Developer [permissions](../../permissions.md) to view the Alert Management list.
+
+You can find the Alert Management list at **{cloud-gear}** **Operations > Alerts** in your project's sidebar.
+Each alert contains the following metrics:
+
+![Alert Management List](img/alert_management_1_v13_0.png)
+
+- **Severity** - The current importance of a alert and how much attention it should receive.
+- **Start time** - How long ago the alert fired. This field uses the standard GitLab pattern of `X time ago`, but is supported by a granular date/time tooltip depending on the user's locale.
+- **End time** - How long ago the alert fired was resolved. This field uses the standard GitLab pattern of `X time ago`, but is supported by a granular date/time tooltip depending on the user's locale.
+- **Alert description** - The description of the alert, which attempts to capture the most meaningful data.
+- **Event count** - The number of times that an alert has fired.
+- **Status** - The [current status](#alert-management-statuses) of the alert.
+
+### Alert Management statuses
+
+Each alert contains a status dropdown to indicate which alerts need investigation.
+Standard alert statuses include `triggered`, `acknowledged`, and `resolved`:
+
+- **Triggered**: No one has begun investigation.
+- **Acknowledged**: Someone is actively investigating the problem.
+- **Resolved**: No further work is required.