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Add a new shell test `stat_metrics_cgrp.sh` to verify metric reporting with `--for-each-cgroup`, both with and without `--bpf-counters`. The test: - Checks if system-wide monitoring is supported (skips if not). - Finds cgroups to test. - Runs `perf stat` with `insn_per_cycle` metric and verifies that the metric is reported for each cgroup. - Dynamically pairs and verifies instructions and cycles counts to avoid false failures on idle cgroups. - Tests both standard mode and BPF counters mode (if supported). Assisted-by: Antigravity:gemini-3-flash Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Svilen Kanev <skanev@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>