Memory leak regression

[LesnyRumcajs]

Summary

Our recent performance improvements are very impressive, but we might have gone too fast too furious.

My node also OOMed over the weekend, logs shared internally. This is a blocker for the next release.

We already identified a couple of candidates for this, this is more for tracking purposes.

Completion Criteria

• Ensure memory usage is bounded - by default the node must not go above 16 GiB with all the caches etc.
• Ensure cache metrics are correct.

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