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A comment on Ask HN: What do you monitor on your servers?. Parent comment
Cache misses don't have anything to do with memory pressure, they're related to caching effectiveness.
Production systems shouldn't have any page faults because they shouldn't be using swap.
The traditional way Linux memory pressure was measured using a very small swap file and check for any usage of it. Modern Linux has the PSI subsystem.
Also, monitoring for OOM events also means a system needs more RAM or a workload needs to be tuned or spread out.
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Cache misses don't have anything to do with memory pressure, they're related to caching effectiveness.
Production systems shouldn't have any page faults because they shouldn't be using swap.
The traditional way Linux memory pressure was measured using a very small swap file and check for any usage of it. Modern Linux has the PSI subsystem.
Also, monitoring for OOM events also means a system needs more RAM or a workload needs to be tuned or spread out.