554ba32d30
Add CpuUsage, MemoryUsage, IOReadBytes, IOReadOperations, and TasksCurrent in a standalone socket-activated varlink service. These metrics are gathered from the kernel via cgroup files and PID1's only role is mapping unit names to cgroup paths — a separate process can query PID1 once for that mapping and then read the cgroup files directly, minimizing PID1 involvement. The new systemd-report-cgroup-metrics service listens at /run/systemd/report/io.systemd.CGroup and exposes: - io.systemd.CGroup.CpuUsage - io.systemd.CGroup.IOReadBytes - io.systemd.CGroup.IOReadOperations - io.systemd.CGroup.MemoryUsage (with type=current/available/peak) - io.systemd.CGroup.TasksCurrent This is spun out of #41078 and based on top of it. Will rebase once that's merged.
System and Service Manager
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