report-basic: cpu, memory, pressure, and disk metrics

Extend the io.systemd.Basic metric families with host-level runtime
metrics: cumulative per-state CPU seconds, memory in use (MemTotal minus
MemAvailable), swap in use, the kernel's 10s pressure stall averages
(cpu/memory/io x some/full). Partitions and stacked devices are excluded
from the disk counters, since their traffic is already accounted for in
the parent device.

Also extend the TEST-74 report subtest with checks for the new metrics.

Network metrics are not added, because the service runs with
PrivateNetwork=yes, and it doesn't make sense to report stats for 'lo'.

After some back-and-forth, I settled on "CPUUsage". We use this scheme of
capitalization in other metric family names: "IPv4Public", "IPv6Public",
IPv4AddressState", "IPv6AddressState", "OSRelease" "SMBIOS" "BootID",
"CPUsOnline", "MachineID", "MachineInfo", "OSRelease",
"SMBIOS.SystemManufacturer", "TPM2.Manufacturer", "TPM2.VendorString",
"IOReadBytes", "IOReadOperations", "CGroup". The exception is
"io.systemd.cgroup.CpuUsage". I think we should treat that one as a
mistake and consider changing it to conform.

This commit is contained in:

Zbigniew Jędrzejewski-Szmek

2026-08-24 23:56:06 +02:00

parent 2e18587872

commit b8cc2ef04b

4 changed files with 342 additions and 29 deletions

									
										src/basic/procfs-util.h
									
		+1
		
												View File
												
				@@ -9,6 +9,7 @@ int procfs_get_threads_max(uint64_t *ret);

				int procfs_tasks_set_limit(uint64_t limit);

				int procfs_tasks_get_current(uint64_t *ret);

				nsec_t procfs_ticks_to_nsec(uint64_t ticks);

				int procfs_cpu_get_usage(nsec_t *ret);

				typedef struct ProcfsCpuTicks {