Add warning notification in settings > monitor page

app/views/projects/settings/operations/show.html.haml

@@ -2,6 +2,21 @@
 - page_title _('Monitor Settings')
 - breadcrumb_title _('Monitor Settings')
 
+.gl-alert.gl-alert-danger.gl-mb-5
+  - removal_epic_link_url = 'https://gitlab.com/groups/gitlab-org/-/epics/7188'
+  - removal_epic_link_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer" class="gl-link">'.html_safe % { url: removal_epic_link_url }
+  - opstrace_link_url = 'https://gitlab.com/groups/gitlab-org/-/epics/6976'
+  - opstrace_link_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer" class="gl-link">'.html_safe % { url: opstrace_link_url }
+  - link_end = '</a>'.html_safe
+  .gl-alert-container
+    = sprite_icon('error', css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
+    .gl-alert-content
+      .gl-alert-title
+        = s_('Deprecations|Feature deprecation and removal')
+      .gl-alert-body
+        %p
+          = html_escape(s_('Deprecations|The metrics, logs and tracing features were deprecated in GitLab 14.7, and are %{removal_link_start} scheduled for removal %{link_end} in GitLab 15.0. For information on a possible replacement, %{opstrace_link_start} learn more about Opstrace %{link_end}.')) % {removal_link_start: removal_epic_link_start, opstrace_link_start: opstrace_link_start, link_end: link_end }
+
 = render 'projects/settings/operations/metrics_dashboard'
 = render 'projects/settings/operations/tracing'
 = render 'projects/settings/operations/error_tracking'