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OnBox started to slow down a lot

Since yesterday, OneBox has been left to slow down strongly. In the load control panel, we see anomalous changes in the load that were not there before https://prnt.sc/10fap64
We did not introduce any innovations, everything works according to the old scheme, this has not been observed before. What's wrong?
OneBox: crm.sportmarket.ua
Original question is available on version: ru

Answers:

Good day.
The lack of information on the graph is due to the fact that the server did not have enough resources (RAM).
It happened Mar 6 20:19:06.
The OS kernel has protection against such cases and oom-killer killed the most active processes (php-fpm and mysql (DB)).
After that, the OS restarted these services.
What causes the load on the system is hard to say right away.
This issue requires further study.
08.03.2021, 10:13
Original comment available on version: ru

Good evening.
Monitored the system.
Should work without peak loads.
18.03.2021, 00:11
Original comment available on version: ru

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