Tune max cache size dynamically

[dennypenta]

Hitting OOM on processing logs must make the system to reduce the max cache size used of the available RAM and retry operation.
if the value was reduced up to 10-20% it's a critical threshold to raise the severity error.

We could identify tons of handlers with different priorities which it must execute to try reducing occupied RAM.
It must throw error logs immediately on any of those attempt.
Ideally provide alert out of the box with the configurable severity level.