Add tier badges for Operations pages

Ensure all of the new Operations pages have tier badges next to the
H1, for Support's benefit.

doc/operations/index.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Project operations
+# Project operations **(CORE)**
 
 GitLab provides a variety of tools to help operate and maintain
 your applications:

doc/operations/metrics/alerts.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Set up alerts for Prometheus metrics
+# Set up alerts for Prometheus metrics **(CORE)**
 
 After [configuring metrics for your CI/CD environment](index.md), you can set up
 alerting for Prometheus metrics depending on the location of your instances, and

doc/operations/metrics/dashboards/index.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Custom dashboards
+# Custom dashboards **(CORE)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/59974) in GitLab 12.1.
 

doc/operations/metrics/dashboards/panel_types.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Panel types for dashboards
+# Panel types for dashboards **(CORE)**
 
 The below panel types are supported in monitoring dashboards.
 

doc/operations/metrics/dashboards/templating_variables.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Templating variables for metrics dashboards
+# Templating variables for metrics dashboards **(CORE)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214539) in GitLab 13.0.
 

doc/operations/metrics/dashboards/variables.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Using Variables
+# Using Variables **(CORE)**
 
 ## Query Variables
 

doc/operations/metrics/dashboards/yaml.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Dashboard YAML properties
+# Dashboard YAML properties **(CORE)**
 
 Dashboards have several components:
 

doc/operations/metrics/dashboards/yaml_number_format.md

@@ -4,7 +4,7 @@ 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
+# Unit formats reference **(CORE)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/201999) in GitLab 12.9.
 

doc/operations/metrics/embed.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Embedding metric charts within GitLab-flavored Markdown
+# Embedding metric charts within GitLab-flavored Markdown **(CORE)**
 
 You can display metrics charts within
 [GitLab Flavored Markdown](../../user/markdown.md#gitlab-flavored-markdown-gfm)

doc/operations/metrics/embed_grafana.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Embedding Grafana charts
+# Embedding Grafana charts **(CORE)**
 
 Grafana metrics can be embedded in [GitLab Flavored Markdown](../../user/markdown.md).
 

doc/operations/metrics/index.md

@@ -4,7 +4,7 @@ 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
 ---
 
-# Monitor metrics for your CI/CD environment
+# Monitor metrics for your CI/CD environment **(CORE)**
 
 After [configuring Prometheus for a cluster](../../user/project/integrations/prometheus.md),
 GitLab attempts to retrieve performance metrics for any [environment](../../ci/environments/index.md) with