Feature Request: Add vm_sysctl collector to expose /proc/sys/vm/* tunables like vm.max_map_count #3366
Description
I'd like to propose adding a new collector named vm_sysctl to the Node Exporter that exposes tunable values from /proc/sys/vm/, such as:
- vm.max_map_count
- vm.swappiness
- vm.dirty_ratio
These are important for monitoring system-level kernel memory limits and are especially critical for applications like Elasticsearch, which depend on specific vm.max_map_count values.