Cluster is unresponsive for a long time

My cluster starts responding extremely slow, and I don’t even understand what is the root cause of that. I didn’t change anything on the application side, the traffic also normal, no spikes, no problems.
I see in the monitoring that for some reasons there is significant drop in operations, and increase in latency. What can cause this problem, is there a way to debug it somehow? this is my setup:

AWS / Frankfurt (eu-central-1)

M20 (General)

It turns out be problems with resources. After upgrading cluster everything is back to normal.

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