promtail: fix high CPU usage on large kubernetes clusters. (#1118)
promtail: fix high CPU usage on large kubernetes clusters. (#1118)

* promtail: add api-level node filter for kubernetes discovery

* promtail: fix hardcoded host value in k8s node filter
grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki