Moved memory monitor thread start to Node start, since node is activated during start.
Merge pull request #694 from mdogan/fix/2.x/memory-monitor

Moved memory monitor thread start to Node start, since node is activated during start.
Upgraded to health monitor so also include cpu metrics + introduced health monitor level off, silent, noisy
Fixed unresolved merge conflict
Merge pull request #699 from pveentjer/improvement/2-maintenance/memory-monitor

Improvement/2 maintenance/memory monitor