[LU-17352] Enhance lljobstat to read existing job_stats files

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Feng Lei
• Reporter: Feng Lei

Description

Improve lljobstat command to read dumped job_stats files, aggregate data and show top jobs.

It is also possible to have a combined job_stats file like:

##########
# mds01
##########
mdt.lustre-MDT0000.job_stats=
job_stats: 
- job_id:          497658
  snapshot_time:   1702371444
  ...
mdt.lustre-MDT0002.job_stats=
job_stats: 
- job_id:          jfm2231
  snapshot_time:   1702371602
  ...
##########
# oss01
##########
....

Issue Links

• is related to: LU-16228 create lljobstats command