Great! I have installed the new kernel in my test VM.
I tested my original node_exporter in a local k8s cluster
Old, Linux 6.14.0-36-generic #36-Ubuntu SMP PREEMPT_DYNAMIC Sat Oct 11 02:18:29
UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```
[...]
node_scrape_collector_duration_seconds{collector="perf"} 7.0563e-05
node_scrape_collector_success{collector="perf"} 1
[...]
```
No perf related metrics.
With the new kernel Linux k8s 6.14.0-37-generic #37-Ubuntu SMP PREEMPT_DYNAMIC
Fri Nov 14 22:10:32 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```
# HELP node_perf_branch_instructions_total Number of CPU branch instructions
# TYPE node_perf_branch_instructions_total counter
node_perf_branch_instructions_total{cpu="0"} 1.07274662e+08
[...]
# HELP node_perf_branch_misses_total Number of CPU branch misses
# TYPE node_perf_branch_misses_total counter
node_perf_branch_misses_total{cpu="0"} 8.273487e+06
[...]
# HELP node_perf_cache_misses_total Number of cache misses
# TYPE node_perf_cache_misses_total counter
node_perf_cache_misses_total{cpu="0"} 1.4965659e+07
[...]
node_scrape_collector_duration_seconds{collector="perf"} 0.004012192
node_scrape_collector_success{collector="perf"} 1
```
I also ran the reproducer code on 6.14.0-36-generic #36-Ubuntu SMP
PREEMPT_DYNAMIC Sat Oct 11 02:18:29 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```
[*] Current perf_event_paranoid level: 4.
[*] This is a custom Ubuntu paranoid level.
[*] Current capabilities: cap_wake_alarm=i cap_perfmon+ep
[!] CPU_CYCLES: Impossible to open perf event
[!] INSTRUCTIONS: Impossible to open perf event
[!] CACHE_REFERENCES: Impossible to open perf event
Some events were not accessible with current capabilities
```
and on Linux k8s 6.14.0-37-generic #37-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14
22:10:32 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```
[*] Current perf_event_paranoid level: 4.
[*] This is a custom Ubuntu paranoid level.
[*] Current capabilities: cap_wake_alarm=i cap_perfmon+ep
[*] CPU_CYCLES: Successfully opened perf event
[*] INSTRUCTIONS: Successfully opened perf event
[*] CACHE_REFERENCES: Successfully opened perf event
All perf events accessible with current capabilities
```
So this works as intended for my usecase.
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https://bugs.launchpad.net/bugs/2131046
Title:
CAP_PERFMON insufficient to get perf data
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