Docs: add metadata for Monitor stage pages

For ease of identification, add metadata about stage ownership
to pages.

doc/administration/audit_events.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Audit Events **(STARTER)**
 
 GitLab offers a way to view the changes made within the GitLab server for owners and administrators on a [paid plan](https://about.gitlab.com/pricing/).

doc/administration/logs.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Log system
 
 GitLab has an advanced log system where everything is logged, so you

doc/administration/monitoring/prometheus/gitlab_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # GitLab exporter
 
 >- Available since [Omnibus GitLab 8.17](https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/1132).

doc/administration/monitoring/prometheus/gitlab_metrics.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # GitLab Prometheus metrics
 
 >**Note:**

doc/administration/monitoring/prometheus/index.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring GitLab with Prometheus
 
 > **Notes:**

doc/administration/monitoring/prometheus/node_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Node exporter
 
 >**Note:**

doc/administration/monitoring/prometheus/pgbouncer_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # PgBouncer exporter
 
 >**Note:**

doc/administration/monitoring/prometheus/postgres_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # PostgreSQL Server Exporter
 
 >**Note:**

doc/administration/monitoring/prometheus/redis_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Redis exporter
 
 >**Note:**

doc/administration/monitoring/prometheus/registry_exporter.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Registry exporter
 
 > [Introduced](https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/2884) in GitLab 11.9.

doc/user/incident_management/index.md

 ---
 description: "GitLab - Incident Management. GitLab offers solutions for handling incidents in your applications and services"
+stage: Monitor
+group: Health
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 ---
 
 # Incident Management

doc/user/project/clusters/index.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Kubernetes clusters
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/35954) in GitLab 10.1 for projects.

doc/user/project/integrations/generic_alerts.md

+---
+stage: Monitor
+group: Health
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Generic alerts integration
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/13203) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 12.4.

doc/user/project/integrations/prometheus.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Prometheus integration
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/8935) in GitLab 9.0.

doc/user/project/integrations/prometheus_library/cloudwatch.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring AWS Resources
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/12621) in GitLab 9.4

doc/user/project/integrations/prometheus_library/haproxy.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring HAProxy
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/12621) in GitLab 9.4

doc/user/project/integrations/prometheus_library/index.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Prometheus Metrics library
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/8935) in GitLab 9.0.

doc/user/project/integrations/prometheus_library/kubernetes.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring Kubernetes
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/8935) in GitLab 9.0.

doc/user/project/integrations/prometheus_library/nginx.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring NGINX
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/12621) in GitLab 9.4

doc/user/project/integrations/prometheus_library/nginx_ingress.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring NGINX Ingress Controller
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/22133) in GitLab 11.7.

doc/user/project/integrations/prometheus_library/nginx_ingress_vts.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Monitoring NGINX Ingress Controller with VTS metrics
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/13438) in GitLab 9.5.

doc/user/project/integrations/prometheus_units.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Unit formats reference
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/201999) in GitLab 12.9.

doc/user/project/operations/error_tracking.md

+---
+stage: Monitor
+group: Health
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Error Tracking
 
 > [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/169) in GitLab 11.8.

doc/user/project/operations/tracing.md

+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # Tracing **(ULTIMATE)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7903) in GitLab Ultimate 11.5.

doc/user/project/status_page/index.md

+---
+stage: Monitor
+group: Health
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # GitLab Status Page
 
 > [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2479) in GitLab 12.10.