chore: add mimir job label for runners metrics
chore: add mimir job label for runners metrics
Metrics from runners have a different job label in Mimir, specifically scrapeConfig/monitoring/prometheus-agent-runner
. This ensures saturation points/dashboards still working in both Mimir and Thanos
context: https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/3401#note_1883326122
Edited by Gregorius Marco