Commits on May 23, 2023

1. server: add debug/pprof/ui/cpu/?node=all endpoint for cluster-wide … …

   …CPU profile
   
   This change adds a debug endpoint to the status server that collects
   a CPU profiles from all nodes in the cluster and merges them before
   rendering the profile. The merge is performed using `pprof.Merge`
   https://pkg.go.dev/github.com/google/pprof/profile#Merge.
   
   A future patch will teach the jobs page to filter out samples from
   this cluster-wide profile that are only labelled with the job's job ID.
   In this way a user can get the cluster-wide CPU profile for a particular
   job making it easier to identify the cause for a hotspot or a
   performance regression.
   
   Release note: None

   

   adityamaru committed May 23, 2023
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