feat(agent): send the pressure (PSI) of the CPU, the memory and the disk - #47
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Contract v0.4.0, "Pressure (PSI)": the share of the minute in which at least one task waited, from the "some" total of /proc/pressure, and its peak within the minute. null without PSI, in the first sample, after a reboot and after a counter went back. Closes #42
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Closes #42.
Part of the monitoring agent stack. This PR is on top of #46. Contract v0.4.0, "Pressure (PSI)".
What changes
/proc/pressure/cpu,/proc/pressure/memoryand/proc/pressure/io. It uses thetotal=counter of thesomeline, notavg10oravg60.cpu_pressure_percent,memory_pressure_percentandio_pressure_percent, each with a_max_percentpeak. A value is the microseconds of wait divided by the microseconds between two readings, times 100, from 0 to 100.nullwhen the kernel has no PSI (the agent writes one warning), in the first sample, after a reboot, after a reading older than 90 seconds, and after a counter went back.Tests
/proc/pressure, a reboot, a counter that went back, an old reading, the first sample, a restart, and a reading without PSI.make checkpasses.