container names are not parsed when using v2 cgroups

[absolution1]

Hi there.

Container names do not seem to be parsed when using v2 cgroups, despite mounting /var/lib/docker/containers. Here is an example line of printout from the hwpc sensor log
I: 25-03-01 23:14:22 perf</system.slice/docker-3307fee8ff7898da36a4030d6c64ad91a84e45bd4fcc581d073613910d263fc5.scope>: monitoring actor started

A brief glance at

hwpc-sensor/src/target_docker.c

Line 45 in 4b7ebec

#define CONTAINER_ID_REGEX "perf_event/docker/([a-f0-9]{64})$"

and

hwpc-sensor/src/target.c

Line 71 in 4b7ebec

if (strstr(cgroup_path, "perf_event/docker"))

suggests powerapi is expecting perf_event to always exist. For my v2 cgroups setup, all of the docker folders are containeed in /sys/fs/cgroup/system.slice

Is this a genuine bug or have I got something ganked in my setup?

PowerAPI rocks by the way!