orangeCatDeveloper commented on issue #3533:
URL: https://github.com/apache/hertzbeat/issues/3533#issuecomment-5861052041
Root cause, still present on master: CPU usage is computed as
`usage=100-idle`, where `idle` comes from `vmstat 1 2 | awk 'NR==4{print
$15}'`. vmstat only prints whole percentages and this samples a single second,
so the value is always an integer and jumps between samples.
https://github.com/apache/hertzbeat/blob/8104d7057c72f9c18dea31d32e076750d2c34020/hertzbeat-manager/src/main/resources/define/app-linux.yml#L373
The same command is used by the other Linux-family templates (centos,
ubuntu, debian, redhat, rockylinux, almalinux, euleros, opensuse, coreos,
freebsd, linux_script). Computing the usage from two `/proc/stat` readings
would give decimal precision.
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