Remove unused `projects_prometheus_active` usage ping metrics
Follow-up if the discussion started here.
Remove the following usage ping metrics.
-
usage_activity_by_stage.monitor.projects_prometheus_active
- Count unique active Prometheus service per user id; Enterprise Edition only -
usage_activity_by_stage_monthly.monitor.projects_prometheus_active
- Count unique active Prometheus service per user id; Enterprise Edition only
Edited by Vitali Tatarintev