IPMI BLOBs handler to export BMC metrics snapshot
This BLOB handler registers one blob with the name "/metric/snapshot".
The contents of the BLOB is a protocol buffer containing an instantaneous snapshot of the BMC's health metrics, which includes the following categories:
- BMC memory metric: mem_available, slab, kernel_stack
- Uptime: uptime in wall clock time, idle process across all cores
- Disk space: free space in RWFS in KiB
- Status of the top 10 processes: cmdline, utime, stime
- File descriptor of top 10 processes: cmdline, file descriptor count
The size of the metrics are usually around 1KB to 1.5KB.