FEATURE: Add message to log when admins are automatically deactivated

app/jobs/scheduled/invalidate_inactive_admins.rb

@@ -22,6 +22,9 @@ module Jobs
           user.deactivate(Discourse.system_user)
           user.email_tokens.update_all(confirmed: false, expired: true)
 
+          reason = I18n.t("user.deactivated_by_inactivity", count: SiteSetting.invalidate_inactive_admin_email_after_days)
+          StaffActionLogger.new(Discourse.system_user).log_user_deactivate(user, reason)
+
           Discourse.authenticators.each do |authenticator|
             if authenticator.can_revoke? && authenticator.description_for_user(user).present?
               authenticator.revoke(user)

config/locales/server.en.yml

@@ -2377,6 +2377,9 @@ en:
   user:
     deactivated: "Was deactivated due to too many bounced emails to '%{email}'."
     deactivated_by_staff: "Deactivated by staff"
+    deactivated_by_inactivity: 
+      one: "Automatically deactivated after %{count} day of inactivity"
+      other: "Automatically deactivated after %{count} days of inactivity"
     activated_by_staff: "Activated by staff"
     new_user_typed_too_fast: "New user typed too fast"
     content_matches_auto_block_regex: "Content matches auto block regex"

spec/jobs/invalidate_inactive_admins_spec.rb

@@ -29,7 +29,16 @@ describe Jobs::InvalidateInactiveAdmins do
         expect(not_seen_admin.reload.email_tokens.where(confirmed: true).exists?).to eq(false)
       end
 
-      it 'makes the user as not active' do
+      it 'makes the user as not active and logs the action' do
+        subject
+        expect(not_seen_admin.reload.active).to eq(false)
+
+        log = UserHistory.last
+        expect(log.target_user_id).to eq(not_seen_admin.id)
+        expect(log.action).to eq(UserHistory.actions[:deactivate_user])
+      end
+
+      it 'adds a staff log' do
         subject
         expect(not_seen_admin.reload.active).to eq(false)
       end