Merge pull request kubernetes#475 from vteratipally/boot_size_disk

catching hung task with pattern like "tasks airflow scheduler: *"

Merge pull request kubernetes#459 from abansal4032/logging-improvements

Add logging levels to custom plugin logs.

Merge pull request kubernetes#442 from abansal4032/custom-plugin-logs…

…-capture

Capture the logs from stderr of custom plugins

Merge pull request kubernetes#426 from abansal4032/health-check-monitor

Add health-check-monitor

Merge pull request kubernetes#410 from xueweiz/stats

Collect more CPU/disk/memory metrics

Merge pull request kubernetes#375 from Random-Liu/fix-channel-close-i…

…ssue

Properly close channel when monitors exit.

Merge pull request kubernetes#253 from finn-no/master

Empty LogPath will use journald's default path.

Merge pull request kubernetes#328 from wangzhen127/cp-custom-plugin-fix

Cherry pick 2f5d032 to v0.6: Don't update condition if status stays False/Unknown for custom plugin

Merge pull request kubernetes#315 from xueweiz/metrics

Report metrics from custom-plugin-monitor

Merge pull request kubernetes#312 from yguo0905/wait-apiserver

Cherry pick kubernetes#308 to v0.6: Support waiting for kube-apiserver to be ready with timout during NPD startup