merlimat opened a new pull request #7475:
URL: https://github.com/apache/pulsar/pull/7475
### Motivation
When using CPU limits on a docker container, the CPU usage on the broker
load report will result incorrect.
We're reporting the CPU usage such as:
```json
"cpu" : {
"usage" : 8.130785075483013,
"limit" : 200.0
},
```
While the limit is correctly reflecting the 2 CPU limitation on the
container, the usage is read from `/proc/stat` is referring to the all the CPUs
in the host machine.
The effect of this is that the broker will appear with a lower CPU % usage
and the load shedding will not be automatically triggered, even though the
broker might be using the entire CPU quota allocated.
Instead, we need to read the usage from `/sys/fs/cgroup/cpu/cpuacct.usage`.
This will work both inside and outside of a container.
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