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high CPU usage on pmm server

romberromber ContributorCurrent User Role Supporter
i've installed pmm server v1.10.0 via docker deployment method.
this is a dedicated server only running pmm server ,it has 16 cores/48GB RAM/1000GB SSD, monitors about 60 mysql servers.
what puzzled me is extremely high CPU usage, almost always 100%,
and caused bad response time.
i used -e METRICS_MEMORY=30720000 and -e METRICS_RETENTION=360h to limit 30GB RAM usage, 15 days retention.

what should i do to improve pmm response?
thanks in advance

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