Add unique users metrics based on agent project
This MR adds three events that are necessary to provide more insightful metrics.
k8s_api_proxy_requests_unique_users_via_ci_access_by_agent_project
k8s_api_proxy_requests_unique_users_via_user_access_by_agent_project
k8s_api_proxy_requests_unique_users_via_pat_access_by_agent_project
It also adds IntGroupedUniqueCounters
to UsagePingData
which will be sent to GitLab Rails.
Part of gitlab-org/gitlab#428008 (closed).
Edited by Taka Nishida