Raise new InternalEvent when user expands settings panel

app/assets/javascripts/settings_panels.js

@@ -25,6 +25,10 @@ export function expandSection(sectionArg) {
       .addClass('animating')
       .one('animationend.animateSection', () => $section.removeClass('animating'));
   }
+
+  InternalEvents.trackEvent('click_expand_panel_on_settings', undefined, {
+    label: $section.find('.settings-title').text(),
+  });
 }
 
 export function closeSection(sectionArg) {

config/events/click_expand_panel_on_settings.yml

+---
+description: User expands a panel on a settings page
+internal_events: true
+action: click_expand_panel_on_settings
+identifiers:
+- project
+- namespace
+- user
+product_section: core_platform
+product_stage: manage
+product_group: foundations
+milestone: '16.11'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/issues/451458
+distributions:
+- ce
+- ee
+tiers:
+- free
+- premium
+- ultimate

config/metrics/counts_28d/count_distinct_user_id_from_click_expand_panel_on_settings_monthly.yml

+---
+key_path: redis_hll_counters.count_distinct_user_id_from_click_expand_panel_on_settings_monthly
+description: Monthly count of unique users who expanded a settings panel
+product_section: core_platform
+product_stage: manage
+product_group: foundations
+performance_indicator_type: []
+value_type: number
+status: active
+milestone: '16.11'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/issues/451458
+time_frame: 28d
+data_source: internal_events
+data_category: optional
+distribution:
+- ce
+- ee
+tier:
+- free
+- premium
+- ultimate
+events:
+- name: click_expand_panel_on_settings
+  unique: user.id

config/metrics/counts_7d/count_distinct_user_id_from_click_expand_panel_on_settings_weekly.yml

+---
+key_path: redis_hll_counters.count_distinct_user_id_from_click_expand_panel_on_settings_weekly
+description: Weekly count of unique users who expanded a settings panel
+product_section: core_platform
+product_stage: manage
+product_group: foundations
+performance_indicator_type: []
+value_type: number
+status: active
+milestone: '16.11'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/issues/451458
+time_frame: 7d
+data_source: internal_events
+data_category: optional
+distribution:
+- ce
+- ee
+tier:
+- free
+- premium
+- ultimate
+events:
+- name: click_expand_panel_on_settings
+  unique: user.id