Merge branch 'docs-aqualls-operations-page' into 'master'

Revamp the landing page for Operations

See merge request gitlab-org/gitlab!38324

doc/operations/index.md

@@ -9,14 +9,89 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 GitLab provides a variety of tools to help operate and maintain
 your applications:
 
+## Measure reliability and stability with metrics
+
+Metrics help you understand the health and performance of your infrastructure,
+applications, and systems by providing insights into your application's reliability,
+stability, and performance. GitLab provides a dashboard out-of-the-box, which you
+can extend with custom metrics, and augment with additional custom dashboards. You
+can track the metrics that matter most to your team, generate automated alerts when
+performance degrades, and manage those alerts - all within GitLab.
+
 - Collect [Prometheus metrics](../user/project/integrations/prometheus_library/index.md).
+- Monitor application status with the [out-of-the-box metrics dashboard](metrics/index.md),
+  which you can [customize](metrics/dashboards/settings.md).
+- Create [custom performance alerts](metrics/alerts.md).
+- Create [custom metrics](metrics/index.md#adding-custom-metrics) and
+  [custom dashboards](metrics/dashboards/index.md).
+
+## Manage alerts and incidents
+
+GitLab helps reduce alert fatigue for IT responders by providing tools to identify
+issues across multiple systems and aggregate alerts in a centralized place. Your
+team needs a single, central interface where they can easily investigate alerts
+using metrics and logs, and promote the critical alerts to incidents.
+
+Are your alerts too noisy? Alerts configured on GitLab metrics can configured
+and fine-tuned in GitLab immediately following a fire-fight.
+
+- [Manage your external alerts](../user/project/operations/alert_management.md) and [manage Incidents](../user/incident_management/index.md) in GitLab.
+- [Configure alerts for metrics](metrics/alerts.md#set-up-alerts-for-prometheus-metrics-core) in GitLab.
+- Create a [status page](incident_management/status_page.md)
+  to communicate efficiently to your users during an incident.
+
+## Track errors in your application
+
+GitLab integrates with [Sentry](https://sentry.io/welcome/) to aggregate errors
+from your application and surface them in the GitLab UI with the sorting and filtering
+features you need to help identify which errors are the most critical. Through the
+entire triage process, your users can create GitLab issues to track critical errors
+and the work required to fix them - all without leaving GitLab.
+
+- Discover and view errors generated by your applications with
+  [Error Tracking](error_tracking.md).
+
+## Trace application health and performance **(ULTIMATE)**
+
+Application tracing in GitLab is a way to measure an application's performance and
+health while it's running. After configuring your application to enable tracing, you
+gain in-depth insight into your application's layers. With application tracing,
+you can measure the execution time of a user journey for troubleshooting or
+optimization purposes.
+
+GitLab integrates with [Jaeger](https://www.jaegertracing.io/) - an open-source,
+end-to-end distributed tracing system tool used for monitoring and troubleshooting
+microservices-based distributed systems - and displays results within GitLab.
+
+- [Trace the performance and health](tracing.md) of a deployed application. **(ULTIMATE)**
+
+## Aggregate and store logs
+
+Developers need to troubleshoot application changes in development, and incident
+responders need aggregated, real-time logs when troubleshooting problems with
+production services. GitLab provides centralized, aggregated log storage for your
+distributed application, enabling you to collect logs across multiple services and
+infrastructure.
+
+- [View logs of pods or managed applications](../user/project/clusters/kubernetes_pod_logs.md)
+  in connected Kubernetes clusters.
+
+## Manage your infrastructure in code
+
+GitLab integrates with [Terraform](https://www.terraform.io/), uniting your GitOps and
+Infrastructure-as-Code (IaC) workflows with GitLab's authentication, authorization,
+and user interface. By lowering the barrier to entry for adopting Terraform, you
+can manage and provision infrastructure through machine-readable definition files,
+rather than physical hardware configuration or interactive configuration tools.
+Definitions are stored in version control, extending proven coding techniques to
+your infrastructure, and blurring the line between what is an application and what is
+an environment.
+
+- Learn how to [manage your infrastructure with GitLab and Terraform](../user/infrastructure/index.md).
+
+## More features
+
 - Deploy to different [environments](../ci/environments/index.md).
-- Manage your [Alerts](../user/project/operations/alert_management.md) and [Incidents](../user/incident_management/index.md).
 - Connect your project to a [Kubernetes cluster](../user/project/clusters/index.md).
-- Manage your infrastructure with [Infrastructure as Code](../user/infrastructure/index.md) approaches.
-- Discover and view errors generated by your applications with [Error Tracking](error_tracking.md).
-- Handle incidents in your applications and services with [Incident Management](incident_management/index.md).
 - See how your application is used and analyze events with [Product Analytics](product_analytics.md).
 - Create, toggle, and remove [Feature Flags](feature_flags.md). **(PREMIUM)**
-- [Trace](tracing.md) the performance and health of a deployed application. **(ULTIMATE)**
-- Change the [settings of the Monitoring Dashboard](metrics/dashboards/settings.md).