Merge branch 'aa-link-to-usage-ping-troubleshooting' into 'master'

Docs link to usage ping troubleshooting

See merge request gitlab-org/gitlab!46963

doc/development/product_analytics/usage_ping.md

@@ -945,3 +945,7 @@ bin/rake gitlab:usage_data:dump_sql_in_json
 # You may pipe the output into a file
 bin/rake gitlab:usage_data:dump_sql_in_yaml > ~/Desktop/usage-metrics-2020-09-02.yaml
 ```
+
+## Generating and troubleshooting usage ping
+
+To get a usage ping, or to troubleshoot caching issues on your GitLab instance, please follow [instructions to generate usage ping](../../administration/troubleshooting/gitlab_rails_cheat_sheet.md#generate-usage-ping).