RAM Memory Monitoring: Metrics and Best Practices
Summary
This guide explains which RAM metrics truly indicate memory pressure (MemAvailable, PSI, page-in/page-out, swap activity, working set) and why free memory is misleading on modern Linux systems. It shows how to collect those metrics on Linux (/proc/meminfo, /proc/pressure/memory), Windows (Performance Monitor counters), VMs and containers (cgroups, kube top), and how to configure alerts that fire before user impact. It provides a practical workflow to detect memory leaks using per-process time-series, baselining, thresholds and profiling tools (heap dumps, pprof, tracemalloc). It recommends alerting on absolute MemAvailable, sustained PSI, swap-in/out activity and working set limits, and suggests tooling options (Prometheus+Grafana, node_exporter, cAdvisor, Zabbix, SolarWinds) to integrate memory metrics into observability and avoid false alarms.
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