reduce Prometheus cardinality round 2: drop 137k more series
- fix traefik double-scrape: kubernetes-pods job was scraping traefik
pods again (43k duplicate series). Added namespace drop rule.
- drop unused cadvisor metrics: container_fs_*, container_blkio_*,
container_pressure_*, container_spec_*, and misc (30k series)
- drop more apiserver histogram buckets: watch_list, watch_cache,
response_sizes, watch_events, admission_controller, workqueue (11k)
- drop unused kube-state-metrics: replicaset_*, pod_tolerations,
pod_labels, endpoint_*, service_*, configmap_*, etc (53k series)
Post-relabel samples: 332k → 142k (-57%)
Ingestion rate: 5,480 → 3,239 samples/sec (-41%)
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