[Post] bpf internals

### Working Title

bpf-internals

### Category

Security & Forensics

### Tags

bpf,ebpf,internals,o11y,memory

### Summary

BPF vs eBPF
tracing v snooping v sampling v profiling v observability
stack trace walking
flame graphs
event sources
kprobes
uprobes
tracepoints
usdt (+dynamic)
PMCs
Performance Analysis
BCC
BPFTrace
CPUs
Memory
Filesystems
Disk I/O
Networking
Security
Languages (Compiled, JIT, Interpreted, Functional?)
Application Level
Kernel
Containers
Vector & Performance Co-Pilot (PCP)
Grafana & PCP
Cloudflare eBPF Prom Exporter
Kubectl trace

### Outline (Optional)

_No response_

### Resources & References

_No response_

### Priority

Medium - On the backlog

### Estimated Effort

Medium - Standard post (1-3 hours)

### Progress Checklist

- [ ] Research complete
- [ ] Outline finalized
- [ ] First draft written
- [ ] Code examples tested
- [ ] Images/diagrams created
- [ ] Post reviewed/edited
- [ ] Published