chore: add monitor=global to stage group availability
chore: add monitor=global to stage group availability
Prevent dashboards not loading due to missing monitor="global", e.g. in https://dashboards.gitlab.net/d/general-availability-indicator/general3a-availability-indicator?orgId=1&var-PROMETHEUS_DS=e58c2f51-20f8-4f4b-ad48-2968782ca7d6&var-environment=gprd&var-stage=main&var-product_stage=All&var-stage_group=All